Add structopt dependency in version 0.3.7

This patch series replaces argparse with structopt in the argument
handling code. As a first step, we need structopt as a dependency.

Import subrepo structopt/:structopt at efbdda4753592e27bc430fb01f7b9650b2f3174d
Import subrepo bitflags/:bitflags at 30668016aca6bd3b02c766e8347e0b4080d4c296
Import subrepo clap/:clap at 784524f7eb193e35f81082cc69454c8c21b948f7
Import subrepo heck/:heck at 093d56fbf001e1506e56dbfa38631d99b1066df1
Import subrepo proc-macro-error/:proc-macro-error at 6c4cfe79a622c5de8ae68557993542be46eacae2
Import subrepo proc-macro2/:proc-macro2 at d5d48eddca4566e5438e8a2cbed4a74e049544de
Import subrepo quote/:quote at 727436c6c137b20f0f34dde5d8fda2679b9747ad
Import subrepo rustversion/:rustversion at 0c5663313516263059ce9059ef81fc7a1cf655ca
Import subrepo syn-mid/:syn-mid at 5d3d85414a9e6674e1857ec22a87b96e04a6851a
Import subrepo syn/:syn at e87c27e87f6f4ef8919d0372bdb056d53ef0d8f3
Import subrepo textwrap/:textwrap at abcd618beae3f74841032aa5b53c1086b0a57ca2
Import subrepo unicode-segmentation/:unicode-segmentation at 637c9874c4fe0c205ff27787faf150a40295c6c3
Import subrepo unicode-width/:unicode-width at 3033826f8bf05e82724140a981d5941e48fce393
Import subrepo unicode-xid/:unicode-xid at 4baae9fffb156ba229665b972a9cd5991787ceb7

64 files changed, 989 insertions, 0 deletions

diff --git a/structopt/tests/ui/bool_default_value.rs b/structopt/tests/ui/bool_default_value.rs
new file mode 100644
index 0000000..9bdb0c9
--- /dev/null
+++ b/structopt/tests/ui/bool_default_value.rs
@@ -0,0 +1,21 @@
+// Copyright 2018 Guillaume Pinot (@TeXitoi) <texitoi@texitoi.eu>
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use structopt::StructOpt;
+
+#[derive(StructOpt, Debug)]
+#[structopt(name = "basic")]
+struct Opt {
+    #[structopt(short, default_value = true)]
+    b: bool,
+}
+
+fn main() {
+    let opt = Opt::from_args();
+    println!("{:?}", opt);
+}
diff --git a/structopt/tests/ui/bool_default_value.stderr b/structopt/tests/ui/bool_default_value.stderr
new file mode 100644
index 0000000..1e26a2d
--- /dev/null
+++ b/structopt/tests/ui/bool_default_value.stderr
@@ -0,0 +1,5 @@
+error: default_value is meaningless for bool
+  --> $DIR/bool_default_value.rs:14:24
+   |
+14 |     #[structopt(short, default_value = true)]
+   |                        ^^^^^^^^^^^^^
diff --git a/structopt/tests/ui/bool_required.rs b/structopt/tests/ui/bool_required.rs
new file mode 100644
index 0000000..018223c
--- /dev/null
+++ b/structopt/tests/ui/bool_required.rs
@@ -0,0 +1,21 @@
+// Copyright 2018 Guillaume Pinot (@TeXitoi) <texitoi@texitoi.eu>
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use structopt::StructOpt;
+
+#[derive(StructOpt, Debug)]
+#[structopt(name = "basic")]
+struct Opt {
+    #[structopt(short, required = true)]
+    b: bool,
+}
+
+fn main() {
+    let opt = Opt::from_args();
+    println!("{:?}", opt);
+}
diff --git a/structopt/tests/ui/bool_required.stderr b/structopt/tests/ui/bool_required.stderr
new file mode 100644
index 0000000..0b80d48
--- /dev/null
+++ b/structopt/tests/ui/bool_required.stderr
@@ -0,0 +1,5 @@
+error: required is meaningless for bool
+  --> $DIR/bool_required.rs:14:24
+   |
+14 |     #[structopt(short, required = true)]
+   |                        ^^^^^^^^
diff --git a/structopt/tests/ui/flatten_and_doc.rs b/structopt/tests/ui/flatten_and_doc.rs
new file mode 100644
index 0000000..2dc154d
--- /dev/null
+++ b/structopt/tests/ui/flatten_and_doc.rs
@@ -0,0 +1,30 @@
+// Copyright 2018 Guillaume Pinot (@TeXitoi) <texitoi@texitoi.eu>
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use structopt::StructOpt;
+
+#[derive(StructOpt, Debug)]
+struct DaemonOpts {
+    #[structopt(short)]
+    user: String,
+    #[structopt(short)]
+    group: String,
+}
+
+#[derive(StructOpt, Debug)]
+#[structopt(name = "basic")]
+struct Opt {
+    /// Opts.
+    #[structopt(flatten)]
+    opts: DaemonOpts,
+}
+
+fn main() {
+    let opt = Opt::from_args();
+    println!("{:?}", opt);
+}
diff --git a/structopt/tests/ui/flatten_and_doc.stderr b/structopt/tests/ui/flatten_and_doc.stderr
new file mode 100644
index 0000000..2724dbb
--- /dev/null
+++ b/structopt/tests/ui/flatten_and_doc.stderr
@@ -0,0 +1,5 @@
+error: methods and doc comments are not allowed for flattened entry
+  --> $DIR/flatten_and_doc.rs:23:17
+   |
+23 |     #[structopt(flatten)]
+   |                 ^^^^^^^
diff --git a/structopt/tests/ui/flatten_and_methods.rs b/structopt/tests/ui/flatten_and_methods.rs
new file mode 100644
index 0000000..ff1af2e
--- /dev/null
+++ b/structopt/tests/ui/flatten_and_methods.rs
@@ -0,0 +1,29 @@
+// Copyright 2018 Guillaume Pinot (@TeXitoi) <texitoi@texitoi.eu>
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use structopt::StructOpt;
+
+#[derive(StructOpt, Debug)]
+struct DaemonOpts {
+    #[structopt(short)]
+    user: String,
+    #[structopt(short)]
+    group: String,
+}
+
+#[derive(StructOpt, Debug)]
+#[structopt(name = "basic")]
+struct Opt {
+    #[structopt(short, flatten)]
+    opts: DaemonOpts,
+}
+
+fn main() {
+    let opt = Opt::from_args();
+    println!("{:?}", opt);
+}
diff --git a/structopt/tests/ui/flatten_and_methods.stderr b/structopt/tests/ui/flatten_and_methods.stderr
new file mode 100644
index 0000000..f058eb3
--- /dev/null
+++ b/structopt/tests/ui/flatten_and_methods.stderr
@@ -0,0 +1,5 @@
+error: methods and doc comments are not allowed for flattened entry
+  --> $DIR/flatten_and_methods.rs:22:24
+   |
+22 |     #[structopt(short, flatten)]
+   |                        ^^^^^^^
diff --git a/structopt/tests/ui/flatten_and_parse.rs b/structopt/tests/ui/flatten_and_parse.rs
new file mode 100644
index 0000000..3317272
--- /dev/null
+++ b/structopt/tests/ui/flatten_and_parse.rs
@@ -0,0 +1,29 @@
+// Copyright 2018 Guillaume Pinot (@TeXitoi) <texitoi@texitoi.eu>
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use structopt::StructOpt;
+
+#[derive(StructOpt, Debug)]
+struct DaemonOpts {
+    #[structopt(short)]
+    user: String,
+    #[structopt(short)]
+    group: String,
+}
+
+#[derive(StructOpt, Debug)]
+#[structopt(name = "basic")]
+struct Opt {
+    #[structopt(flatten, parse(from_occurrences))]
+    opts: DaemonOpts,
+}
+
+fn main() {
+    let opt = Opt::from_args();
+    println!("{:?}", opt);
+}
diff --git a/structopt/tests/ui/flatten_and_parse.stderr b/structopt/tests/ui/flatten_and_parse.stderr
new file mode 100644
index 0000000..e217a84
--- /dev/null
+++ b/structopt/tests/ui/flatten_and_parse.stderr
@@ -0,0 +1,5 @@
+error: parse attribute is not allowed for flattened entry
+  --> $DIR/flatten_and_parse.rs:22:26
+   |
+22 |     #[structopt(flatten, parse(from_occurrences))]
+   |                          ^^^^^
diff --git a/structopt/tests/ui/non_existent_attr.rs b/structopt/tests/ui/non_existent_attr.rs
new file mode 100644
index 0000000..96daf45
--- /dev/null
+++ b/structopt/tests/ui/non_existent_attr.rs
@@ -0,0 +1,21 @@
+// Copyright 2018 Guillaume Pinot (@TeXitoi) <texitoi@texitoi.eu>
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use structopt::StructOpt;
+
+#[derive(StructOpt, Debug)]
+#[structopt(name = "basic")]
+struct Opt {
+    #[structopt(short, non_existing_attribute = 1)]
+    debug: bool,
+}
+
+fn main() {
+    let opt = Opt::from_args();
+    println!("{:?}", opt);
+}
diff --git a/structopt/tests/ui/non_existent_attr.stderr b/structopt/tests/ui/non_existent_attr.stderr
new file mode 100644
index 0000000..17bb87f
--- /dev/null
+++ b/structopt/tests/ui/non_existent_attr.stderr
@@ -0,0 +1,5 @@
+error[E0599]: no method named `non_existing_attribute` found for type `clap::args::arg::Arg<'_, '_>` in the current scope
+  --> $DIR/non_existent_attr.rs:14:24
+   |
+14 |     #[structopt(short, non_existing_attribute = 1)]
+   |                        ^^^^^^^^^^^^^^^^^^^^^^ method not found in `clap::args::arg::Arg<'_, '_>`
diff --git a/structopt/tests/ui/opt_opt_nonpositional.rs b/structopt/tests/ui/opt_opt_nonpositional.rs
new file mode 100644
index 0000000..2a08105
--- /dev/null
+++ b/structopt/tests/ui/opt_opt_nonpositional.rs
@@ -0,0 +1,20 @@
+// Copyright 2018 Guillaume Pinot (@TeXitoi) <texitoi@texitoi.eu>
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use structopt::StructOpt;
+
+#[derive(StructOpt, Debug)]
+#[structopt(name = "basic")]
+struct Opt {
+    n: Option<Option<u32>>,
+}
+
+fn main() {
+    let opt = Opt::from_args();
+    println!("{:?}", opt);
+}
diff --git a/structopt/tests/ui/opt_opt_nonpositional.stderr b/structopt/tests/ui/opt_opt_nonpositional.stderr
new file mode 100644
index 0000000..586bf7a
--- /dev/null
+++ b/structopt/tests/ui/opt_opt_nonpositional.stderr
@@ -0,0 +1,5 @@
+error: Option<Option<T>> type is meaningless for positional argument
+  --> $DIR/opt_opt_nonpositional.rs:14:8
+   |
+14 |     n: Option<Option<u32>>,
+   |        ^^^^^^
diff --git a/structopt/tests/ui/opt_vec_nonpositional.rs b/structopt/tests/ui/opt_vec_nonpositional.rs
new file mode 100644
index 0000000..0f6f078
--- /dev/null
+++ b/structopt/tests/ui/opt_vec_nonpositional.rs
@@ -0,0 +1,20 @@
+// Copyright 2018 Guillaume Pinot (@TeXitoi) <texitoi@texitoi.eu>
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use structopt::StructOpt;
+
+#[derive(StructOpt, Debug)]
+#[structopt(name = "basic")]
+struct Opt {
+    n: Option<Vec<u32>>,
+}
+
+fn main() {
+    let opt = Opt::from_args();
+    println!("{:?}", opt);
+}
diff --git a/structopt/tests/ui/opt_vec_nonpositional.stderr b/structopt/tests/ui/opt_vec_nonpositional.stderr
new file mode 100644
index 0000000..6f01de5
--- /dev/null
+++ b/structopt/tests/ui/opt_vec_nonpositional.stderr
@@ -0,0 +1,5 @@
+error: Option<Vec<T>> type is meaningless for positional argument
+  --> $DIR/opt_vec_nonpositional.rs:14:8
+   |
+14 |     n: Option<Vec<u32>>,
+   |        ^^^^^^
diff --git a/structopt/tests/ui/option_default_value.rs b/structopt/tests/ui/option_default_value.rs
new file mode 100644
index 0000000..a86bc0e
--- /dev/null
+++ b/structopt/tests/ui/option_default_value.rs
@@ -0,0 +1,21 @@
+// Copyright 2018 Guillaume Pinot (@TeXitoi) <texitoi@texitoi.eu>
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use structopt::StructOpt;
+
+#[derive(StructOpt, Debug)]
+#[structopt(name = "basic")]
+struct Opt {
+    #[structopt(short, default_value = 1)]
+    n: Option<u32>,
+}
+
+fn main() {
+    let opt = Opt::from_args();
+    println!("{:?}", opt);
+}
diff --git a/structopt/tests/ui/option_default_value.stderr b/structopt/tests/ui/option_default_value.stderr
new file mode 100644
index 0000000..2215497
--- /dev/null
+++ b/structopt/tests/ui/option_default_value.stderr
@@ -0,0 +1,5 @@
+error: default_value is meaningless for Option
+  --> $DIR/option_default_value.rs:14:24
+   |
+14 |     #[structopt(short, default_value = 1)]
+   |                        ^^^^^^^^^^^^^
diff --git a/structopt/tests/ui/option_required.rs b/structopt/tests/ui/option_required.rs
new file mode 100644
index 0000000..d91afbf
--- /dev/null
+++ b/structopt/tests/ui/option_required.rs
@@ -0,0 +1,21 @@
+// Copyright 2018 Guillaume Pinot (@TeXitoi) <texitoi@texitoi.eu>
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use structopt::StructOpt;
+
+#[derive(StructOpt, Debug)]
+#[structopt(name = "basic")]
+struct Opt {
+    #[structopt(short, required = true)]
+    n: Option<u32>,
+}
+
+fn main() {
+    let opt = Opt::from_args();
+    println!("{:?}", opt);
+}
diff --git a/structopt/tests/ui/option_required.stderr b/structopt/tests/ui/option_required.stderr
new file mode 100644
index 0000000..0230d57
--- /dev/null
+++ b/structopt/tests/ui/option_required.stderr
@@ -0,0 +1,5 @@
+error: required is meaningless for Option
+  --> $DIR/option_required.rs:14:24
+   |
+14 |     #[structopt(short, required = true)]
+   |                        ^^^^^^^^
diff --git a/structopt/tests/ui/parse_empty_try_from_os.rs b/structopt/tests/ui/parse_empty_try_from_os.rs
new file mode 100644
index 0000000..acfef0b
--- /dev/null
+++ b/structopt/tests/ui/parse_empty_try_from_os.rs
@@ -0,0 +1,21 @@
+// Copyright 2018 Guillaume Pinot (@TeXitoi) <texitoi@texitoi.eu>
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use structopt::StructOpt;
+
+#[derive(StructOpt, Debug)]
+#[structopt(name = "basic")]
+struct Opt {
+    #[structopt(parse(try_from_os_str))]
+    s: String,
+}
+
+fn main() {
+    let opt = Opt::from_args();
+    println!("{:?}", opt);
+}
diff --git a/structopt/tests/ui/parse_empty_try_from_os.stderr b/structopt/tests/ui/parse_empty_try_from_os.stderr
new file mode 100644
index 0000000..3dc9f24
--- /dev/null
+++ b/structopt/tests/ui/parse_empty_try_from_os.stderr
@@ -0,0 +1,5 @@
+error: you must set parser for `try_from_os_str` explicitly
+  --> $DIR/parse_empty_try_from_os.rs:14:23
+   |
+14 |     #[structopt(parse(try_from_os_str))]
+   |                       ^^^^^^^^^^^^^^^
diff --git a/structopt/tests/ui/parse_function_is_not_path.rs b/structopt/tests/ui/parse_function_is_not_path.rs
new file mode 100644
index 0000000..5eebc57
--- /dev/null
+++ b/structopt/tests/ui/parse_function_is_not_path.rs
@@ -0,0 +1,21 @@
+// Copyright 2018 Guillaume Pinot (@TeXitoi) <texitoi@texitoi.eu>
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use structopt::StructOpt;
+
+#[derive(StructOpt, Debug)]
+#[structopt(name = "basic")]
+struct Opt {
+    #[structopt(parse(from_str = "2"))]
+    s: String,
+}
+
+fn main() {
+    let opt = Opt::from_args();
+    println!("{:?}", opt);
+}
diff --git a/structopt/tests/ui/parse_function_is_not_path.stderr b/structopt/tests/ui/parse_function_is_not_path.stderr
new file mode 100644
index 0000000..7cf7444
--- /dev/null
+++ b/structopt/tests/ui/parse_function_is_not_path.stderr
@@ -0,0 +1,5 @@
+error: `parse` argument must be a function path
+  --> $DIR/parse_function_is_not_path.rs:14:34
+   |
+14 |     #[structopt(parse(from_str = "2"))]
+   |                                  ^^^
diff --git a/structopt/tests/ui/parse_literal_spec.rs b/structopt/tests/ui/parse_literal_spec.rs
new file mode 100644
index 0000000..b6f125a
--- /dev/null
+++ b/structopt/tests/ui/parse_literal_spec.rs
@@ -0,0 +1,21 @@
+// Copyright 2018 Guillaume Pinot (@TeXitoi) <texitoi@texitoi.eu>
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use structopt::StructOpt;
+
+#[derive(StructOpt, Debug)]
+#[structopt(name = "basic")]
+struct Opt {
+    #[structopt(parse("from_str"))]
+    s: String,
+}
+
+fn main() {
+    let opt = Opt::from_args();
+    println!("{:?}", opt);
+}
diff --git a/structopt/tests/ui/parse_literal_spec.stderr b/structopt/tests/ui/parse_literal_spec.stderr
new file mode 100644
index 0000000..6e99e8b
--- /dev/null
+++ b/structopt/tests/ui/parse_literal_spec.stderr
@@ -0,0 +1,5 @@
+error: parser specification must start with identifier
+  --> $DIR/parse_literal_spec.rs:14:23
+   |
+14 |     #[structopt(parse("from_str"))]
+   |                       ^^^^^^^^^^
diff --git a/structopt/tests/ui/parse_not_zero_args.rs b/structopt/tests/ui/parse_not_zero_args.rs
new file mode 100644
index 0000000..8729178
--- /dev/null
+++ b/structopt/tests/ui/parse_not_zero_args.rs
@@ -0,0 +1,21 @@
+// Copyright 2018 Guillaume Pinot (@TeXitoi) <texitoi@texitoi.eu>
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use structopt::StructOpt;
+
+#[derive(StructOpt, Debug)]
+#[structopt(name = "basic")]
+struct Opt {
+    #[structopt(parse(from_str, from_str))]
+    s: String,
+}
+
+fn main() {
+    let opt = Opt::from_args();
+    println!("{:?}", opt);
+}
diff --git a/structopt/tests/ui/parse_not_zero_args.stderr b/structopt/tests/ui/parse_not_zero_args.stderr
new file mode 100644
index 0000000..11abe06
--- /dev/null
+++ b/structopt/tests/ui/parse_not_zero_args.stderr
@@ -0,0 +1,5 @@
+error: parse must have exactly one argument
+  --> $DIR/parse_not_zero_args.rs:14:17
+   |
+14 |     #[structopt(parse(from_str, from_str))]
+   |                 ^^^^^
diff --git a/structopt/tests/ui/positional_bool.rs b/structopt/tests/ui/positional_bool.rs
new file mode 100644
index 0000000..4dbf538
--- /dev/null
+++ b/structopt/tests/ui/positional_bool.rs
@@ -0,0 +1,10 @@
+use structopt::StructOpt;
+
+#[derive(StructOpt, Debug)]
+struct Opt {
+    verbose: bool,
+}
+
+fn main() {
+    Opt::from_args();
+}
\ No newline at end of file
diff --git a/structopt/tests/ui/positional_bool.stderr b/structopt/tests/ui/positional_bool.stderr
new file mode 100644
index 0000000..c3ed1ad
--- /dev/null
+++ b/structopt/tests/ui/positional_bool.stderr
@@ -0,0 +1,10 @@
+error: `bool` cannot be used as positional parameter with default parser
+
+  = help: if you want to create a flag add `long` or `short`
+  = help: If you really want a boolean parameter add an explicit parser, for example `parse(try_from_str)`
+  = note: see also https://github.com/TeXitoi/structopt/tree/master/examples/true_or_false.rs
+
+ --> $DIR/positional_bool.rs:5:14
+  |
+5 |     verbose: bool,
+  |              ^^^^
diff --git a/structopt/tests/ui/raw.rs b/structopt/tests/ui/raw.rs
new file mode 100644
index 0000000..b94f783
--- /dev/null
+++ b/structopt/tests/ui/raw.rs
@@ -0,0 +1,25 @@
+// Copyright 2018 Guillaume Pinot (@TeXitoi) <texitoi@texitoi.eu>
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use structopt::StructOpt;
+
+#[derive(StructOpt, Debug)]
+struct Opt {
+    #[structopt(raw(case_insensitive = "true"))]
+    s: String,
+}
+
+#[derive(StructOpt, Debug)]
+struct Opt2 {
+    #[structopt(raw(requires_if = r#""one", "two""#))]
+    s: String,
+}
+fn main() {
+    let opt = Opt::from_args();
+    println!("{:?}", opt);
+}
diff --git a/structopt/tests/ui/raw.stderr b/structopt/tests/ui/raw.stderr
new file mode 100644
index 0000000..93b5e38
--- /dev/null
+++ b/structopt/tests/ui/raw.stderr
@@ -0,0 +1,19 @@
+error: `#[structopt(raw(...))` attributes are removed in structopt 0.3, they are replaced with raw methods
+
+  = help: if you meant to call `clap::Arg::raw()` method you should use bool literal, like `raw(true)` or `raw(false)`
+  = note: if you need to call `clap::Arg/App::case_insensitive` method you can do it like this: #[structopt(case_insensitive = true)]
+
+  --> $DIR/raw.rs:13:17
+   |
+13 |     #[structopt(raw(case_insensitive = "true"))]
+   |                 ^^^
+
+error: `#[structopt(raw(...))` attributes are removed in structopt 0.3, they are replaced with raw methods
+
+  = help: if you meant to call `clap::Arg::raw()` method you should use bool literal, like `raw(true)` or `raw(false)`
+  = note: if you need to call `clap::Arg/App::requires_if` method you can do it like this: #[structopt(requires_if("one", "two"))]
+
+  --> $DIR/raw.rs:19:17
+   |
+19 |     #[structopt(raw(requires_if = r#""one", "two""#))]
+   |                 ^^^
diff --git a/structopt/tests/ui/rename_all_wrong_casing.rs b/structopt/tests/ui/rename_all_wrong_casing.rs
new file mode 100644
index 0000000..4dabe14
--- /dev/null
+++ b/structopt/tests/ui/rename_all_wrong_casing.rs
@@ -0,0 +1,21 @@
+// Copyright 2018 Guillaume Pinot (@TeXitoi) <texitoi@texitoi.eu>
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use structopt::StructOpt;
+
+#[derive(StructOpt, Debug)]
+#[structopt(name = "basic", rename_all = "fail")]
+struct Opt {
+    #[structopt(short)]
+    s: String,
+}
+
+fn main() {
+    let opt = Opt::from_args();
+    println!("{:?}", opt);
+}
diff --git a/structopt/tests/ui/rename_all_wrong_casing.stderr b/structopt/tests/ui/rename_all_wrong_casing.stderr
new file mode 100644
index 0000000..2a72080
--- /dev/null
+++ b/structopt/tests/ui/rename_all_wrong_casing.stderr
@@ -0,0 +1,5 @@
+error: unsupported casing: `fail`
+  --> $DIR/rename_all_wrong_casing.rs:12:42
+   |
+12 | #[structopt(name = "basic", rename_all = "fail")]
+   |                                          ^^^^^^
diff --git a/structopt/tests/ui/skip_flatten.rs b/structopt/tests/ui/skip_flatten.rs
new file mode 100644
index 0000000..8668ec2
--- /dev/null
+++ b/structopt/tests/ui/skip_flatten.rs
@@ -0,0 +1,42 @@
+// Copyright 2018 Guillaume Pinot (@TeXitoi) <texitoi@texitoi.eu>
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use structopt::StructOpt;
+
+#[derive(StructOpt, Debug)]
+#[structopt(name = "make-cookie")]
+struct MakeCookie {
+    #[structopt(short)]
+    s: String,
+
+    #[structopt(skip, flatten)]
+    cmd: Command,
+}
+
+#[derive(StructOpt, Debug)]
+enum Command {
+    #[structopt(name = "pound")]
+    /// Pound acorns into flour for cookie dough.
+    Pound { acorns: u32 },
+
+    Sparkle {
+        #[structopt(short)]
+        color: String,
+    },
+}
+
+impl Default for Command {
+    fn default() -> Self {
+        Command::Pound { acorns: 0 }
+    }
+}
+
+fn main() {
+    let opt = MakeCookie::from_args();
+    println!("{:?}", opt);
+}
diff --git a/structopt/tests/ui/skip_flatten.stderr b/structopt/tests/ui/skip_flatten.stderr
new file mode 100644
index 0000000..76477a3
--- /dev/null
+++ b/structopt/tests/ui/skip_flatten.stderr
@@ -0,0 +1,5 @@
+error: subcommand, flatten and skip cannot be used together
+  --> $DIR/skip_flatten.rs:17:23
+   |
+17 |     #[structopt(skip, flatten)]
+   |                       ^^^^^^^
diff --git a/structopt/tests/ui/skip_subcommand.rs b/structopt/tests/ui/skip_subcommand.rs
new file mode 100644
index 0000000..5d21426
--- /dev/null
+++ b/structopt/tests/ui/skip_subcommand.rs
@@ -0,0 +1,42 @@
+// Copyright 2018 Guillaume Pinot (@TeXitoi) <texitoi@texitoi.eu>
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use structopt::StructOpt;
+
+#[derive(StructOpt, Debug)]
+#[structopt(name = "make-cookie")]
+struct MakeCookie {
+    #[structopt(short)]
+    s: String,
+
+    #[structopt(subcommand, skip)]
+    cmd: Command,
+}
+
+#[derive(StructOpt, Debug)]
+enum Command {
+    #[structopt(name = "pound")]
+    /// Pound acorns into flour for cookie dough.
+    Pound { acorns: u32 },
+
+    Sparkle {
+        #[structopt(short)]
+        color: String,
+    },
+}
+
+impl Default for Command {
+    fn default() -> Self {
+        Command::Pound { acorns: 0 }
+    }
+}
+
+fn main() {
+    let opt = MakeCookie::from_args();
+    println!("{:?}", opt);
+}
diff --git a/structopt/tests/ui/skip_subcommand.stderr b/structopt/tests/ui/skip_subcommand.stderr
new file mode 100644
index 0000000..aba2d69
--- /dev/null
+++ b/structopt/tests/ui/skip_subcommand.stderr
@@ -0,0 +1,5 @@
+error: subcommand, flatten and skip cannot be used together
+  --> $DIR/skip_subcommand.rs:17:29
+   |
+17 |     #[structopt(subcommand, skip)]
+   |                             ^^^^
diff --git a/structopt/tests/ui/skip_with_other_options.rs b/structopt/tests/ui/skip_with_other_options.rs
new file mode 100644
index 0000000..73c5342
--- /dev/null
+++ b/structopt/tests/ui/skip_with_other_options.rs
@@ -0,0 +1,15 @@
+use structopt::StructOpt;
+
+#[derive(StructOpt, Debug)]
+#[structopt(name = "test")]
+pub struct Opt {
+    #[structopt(long)]
+    a: u32,
+    #[structopt(skip, long)]
+    b: u32,
+}
+
+fn main() {
+    let opt = Opt::from_args();
+    println!("{:?}", opt);
+}
diff --git a/structopt/tests/ui/skip_with_other_options.stderr b/structopt/tests/ui/skip_with_other_options.stderr
new file mode 100644
index 0000000..3345f92
--- /dev/null
+++ b/structopt/tests/ui/skip_with_other_options.stderr
@@ -0,0 +1,5 @@
+error: methods are not allowed for skipped fields
+ --> $DIR/skip_with_other_options.rs:8:17
+  |
+8 |     #[structopt(skip, long)]
+  |                 ^^^^
diff --git a/structopt/tests/ui/skip_without_default.rs b/structopt/tests/ui/skip_without_default.rs
new file mode 100644
index 0000000..bc47511
--- /dev/null
+++ b/structopt/tests/ui/skip_without_default.rs
@@ -0,0 +1,29 @@
+// Copyright 2018 Guillaume Pinot (@TeXitoi) <texitoi@texitoi.eu>
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use structopt::StructOpt;
+
+#[derive(Debug)]
+enum Kind {
+    A,
+    B,
+}
+
+#[derive(StructOpt, Debug)]
+#[structopt(name = "test")]
+pub struct Opt {
+    #[structopt(short)]
+    number: u32,
+    #[structopt(skip)]
+    k: Kind,
+}
+
+fn main() {
+    let opt = Opt::from_args();
+    println!("{:?}", opt);
+}
diff --git a/structopt/tests/ui/skip_without_default.stderr b/structopt/tests/ui/skip_without_default.stderr
new file mode 100644
index 0000000..330898f
--- /dev/null
+++ b/structopt/tests/ui/skip_without_default.stderr
@@ -0,0 +1,9 @@
+error[E0277]: the trait bound `Kind: std::default::Default` is not satisfied
+  --> $DIR/skip_without_default.rs:22:17
+   |
+22 |     #[structopt(skip)]
+   |                 ^^^^ the trait `std::default::Default` is not implemented for `Kind`
+   |
+   = note: required by `std::default::Default::default`
+
+For more information about this error, try `rustc --explain E0277`.
diff --git a/structopt/tests/ui/struct_flatten.rs b/structopt/tests/ui/struct_flatten.rs
new file mode 100644
index 0000000..2b205f1
--- /dev/null
+++ b/structopt/tests/ui/struct_flatten.rs
@@ -0,0 +1,21 @@
+// Copyright 2018 Guillaume Pinot (@TeXitoi) <texitoi@texitoi.eu>
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use structopt::StructOpt;
+
+#[derive(StructOpt, Debug)]
+#[structopt(name = "basic", flatten)]
+struct Opt {
+    #[structopt(short)]
+    s: String,
+}
+
+fn main() {
+    let opt = Opt::from_args();
+    println!("{:?}", opt);
+}
diff --git a/structopt/tests/ui/struct_flatten.stderr b/structopt/tests/ui/struct_flatten.stderr
new file mode 100644
index 0000000..7f0fc6d
--- /dev/null
+++ b/structopt/tests/ui/struct_flatten.stderr
@@ -0,0 +1,5 @@
+error: flatten is only allowed on fields
+  --> $DIR/struct_flatten.rs:12:29
+   |
+12 | #[structopt(name = "basic", flatten)]
+   |                             ^^^^^^^
diff --git a/structopt/tests/ui/struct_parse.rs b/structopt/tests/ui/struct_parse.rs
new file mode 100644
index 0000000..e428b23
--- /dev/null
+++ b/structopt/tests/ui/struct_parse.rs
@@ -0,0 +1,21 @@
+// Copyright 2018 Guillaume Pinot (@TeXitoi) <texitoi@texitoi.eu>
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use structopt::StructOpt;
+
+#[derive(StructOpt, Debug)]
+#[structopt(name = "basic", parse(from_str))]
+struct Opt {
+    #[structopt(short)]
+    s: String,
+}
+
+fn main() {
+    let opt = Opt::from_args();
+    println!("{:?}", opt);
+}
diff --git a/structopt/tests/ui/struct_parse.stderr b/structopt/tests/ui/struct_parse.stderr
new file mode 100644
index 0000000..5518214
--- /dev/null
+++ b/structopt/tests/ui/struct_parse.stderr
@@ -0,0 +1,5 @@
+error: `parse` attribute is only allowed on fields
+  --> $DIR/struct_parse.rs:12:29
+   |
+12 | #[structopt(name = "basic", parse(from_str))]
+   |                             ^^^^^
diff --git a/structopt/tests/ui/struct_subcommand.rs b/structopt/tests/ui/struct_subcommand.rs
new file mode 100644
index 0000000..ac0b145
--- /dev/null
+++ b/structopt/tests/ui/struct_subcommand.rs
@@ -0,0 +1,21 @@
+// Copyright 2018 Guillaume Pinot (@TeXitoi) <texitoi@texitoi.eu>
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use structopt::StructOpt;
+
+#[derive(StructOpt, Debug)]
+#[structopt(name = "basic", subcommand)]
+struct Opt {
+    #[structopt(short)]
+    s: String,
+}
+
+fn main() {
+    let opt = Opt::from_args();
+    println!("{:?}", opt);
+}
diff --git a/structopt/tests/ui/struct_subcommand.stderr b/structopt/tests/ui/struct_subcommand.stderr
new file mode 100644
index 0000000..438f6f8
--- /dev/null
+++ b/structopt/tests/ui/struct_subcommand.stderr
@@ -0,0 +1,5 @@
+error: subcommand is only allowed on fields
+  --> $DIR/struct_subcommand.rs:12:29
+   |
+12 | #[structopt(name = "basic", subcommand)]
+   |                             ^^^^^^^^^^
diff --git a/structopt/tests/ui/structopt_empty_attr.rs b/structopt/tests/ui/structopt_empty_attr.rs
new file mode 100644
index 0000000..a7fc0b9
--- /dev/null
+++ b/structopt/tests/ui/structopt_empty_attr.rs
@@ -0,0 +1,22 @@
+// Copyright 2018 Guillaume Pinot (@TeXitoi) <texitoi@texitoi.eu>
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use structopt::StructOpt;
+
+#[derive(StructOpt, Debug)]
+#[structopt(name = "basic")]
+struct Opt {
+    #[structopt]
+    debug: bool,
+}
+
+fn main() {
+    let opt = Opt::from_args();
+    println!("{:?}", opt);
+}
+
diff --git a/structopt/tests/ui/structopt_empty_attr.stderr b/structopt/tests/ui/structopt_empty_attr.stderr
new file mode 100644
index 0000000..dde3630
--- /dev/null
+++ b/structopt/tests/ui/structopt_empty_attr.stderr
@@ -0,0 +1,5 @@
+error: expected parentheses after `structopt`
+  --> $DIR/structopt_empty_attr.rs:14:7
+   |
+14 |     #[structopt]
+   |       ^^^^^^^^^
diff --git a/structopt/tests/ui/structopt_name_value_attr.rs b/structopt/tests/ui/structopt_name_value_attr.rs
new file mode 100644
index 0000000..3d9388f
--- /dev/null
+++ b/structopt/tests/ui/structopt_name_value_attr.rs
@@ -0,0 +1,22 @@
+// Copyright 2018 Guillaume Pinot (@TeXitoi) <texitoi@texitoi.eu>
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use structopt::StructOpt;
+
+#[derive(StructOpt, Debug)]
+#[structopt(name = "basic")]
+struct Opt {
+    #[structopt = "short"]
+    debug: bool,
+}
+
+fn main() {
+    let opt = Opt::from_args();
+    println!("{:?}", opt);
+}
+
diff --git a/structopt/tests/ui/structopt_name_value_attr.stderr b/structopt/tests/ui/structopt_name_value_attr.stderr
new file mode 100644
index 0000000..f681978
--- /dev/null
+++ b/structopt/tests/ui/structopt_name_value_attr.stderr
@@ -0,0 +1,5 @@
+error: expected parentheses
+  --> $DIR/structopt_name_value_attr.rs:14:17
+   |
+14 |     #[structopt = "short"]
+   |                 ^
diff --git a/structopt/tests/ui/subcommand_and_flatten.rs b/structopt/tests/ui/subcommand_and_flatten.rs
new file mode 100644
index 0000000..742ee6d
--- /dev/null
+++ b/structopt/tests/ui/subcommand_and_flatten.rs
@@ -0,0 +1,36 @@
+// Copyright 2018 Guillaume Pinot (@TeXitoi) <texitoi@texitoi.eu>
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use structopt::StructOpt;
+
+#[derive(StructOpt, Debug)]
+#[structopt(name = "make-cookie")]
+struct MakeCookie {
+    #[structopt(short)]
+    s: String,
+
+    #[structopt(subcommand, flatten)]
+    cmd: Command,
+}
+
+#[derive(StructOpt, Debug)]
+enum Command {
+    #[structopt(name = "pound")]
+    /// Pound acorns into flour for cookie dough.
+    Pound { acorns: u32 },
+
+    Sparkle {
+        #[structopt(short)]
+        color: String,
+    },
+}
+
+fn main() {
+    let opt = MakeCookie::from_args();
+    println!("{:?}", opt);
+}
diff --git a/structopt/tests/ui/subcommand_and_flatten.stderr b/structopt/tests/ui/subcommand_and_flatten.stderr
new file mode 100644
index 0000000..cacea5e
--- /dev/null
+++ b/structopt/tests/ui/subcommand_and_flatten.stderr
@@ -0,0 +1,5 @@
+error: subcommand, flatten and skip cannot be used together
+  --> $DIR/subcommand_and_flatten.rs:17:29
+   |
+17 |     #[structopt(subcommand, flatten)]
+   |                             ^^^^^^^
diff --git a/structopt/tests/ui/subcommand_and_methods.rs b/structopt/tests/ui/subcommand_and_methods.rs
new file mode 100644
index 0000000..890f10c
--- /dev/null
+++ b/structopt/tests/ui/subcommand_and_methods.rs
@@ -0,0 +1,36 @@
+// Copyright 2018 Guillaume Pinot (@TeXitoi) <texitoi@texitoi.eu>
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use structopt::StructOpt;
+
+#[derive(StructOpt, Debug)]
+#[structopt(name = "make-cookie")]
+struct MakeCookie {
+    #[structopt(short)]
+    s: String,
+
+    #[structopt(subcommand, long)]
+    cmd: Command,
+}
+
+#[derive(StructOpt, Debug)]
+enum Command {
+    #[structopt(name = "pound")]
+    /// Pound acorns into flour for cookie dough.
+    Pound { acorns: u32 },
+
+    Sparkle {
+        #[structopt(short)]
+        color: String,
+    },
+}
+
+fn main() {
+    let opt = MakeCookie::from_args();
+    println!("{:?}", opt);
+}
diff --git a/structopt/tests/ui/subcommand_and_methods.stderr b/structopt/tests/ui/subcommand_and_methods.stderr
new file mode 100644
index 0000000..ccaf28d
--- /dev/null
+++ b/structopt/tests/ui/subcommand_and_methods.stderr
@@ -0,0 +1,5 @@
+error: methods in attributes are not allowed for subcommand
+  --> $DIR/subcommand_and_methods.rs:17:17
+   |
+17 |     #[structopt(subcommand, long)]
+   |                 ^^^^^^^^^^
diff --git a/structopt/tests/ui/subcommand_and_parse.rs b/structopt/tests/ui/subcommand_and_parse.rs
new file mode 100644
index 0000000..f24e4bc
--- /dev/null
+++ b/structopt/tests/ui/subcommand_and_parse.rs
@@ -0,0 +1,36 @@
+// Copyright 2018 Guillaume Pinot (@TeXitoi) <texitoi@texitoi.eu>
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use structopt::StructOpt;
+
+#[derive(StructOpt, Debug)]
+#[structopt(name = "make-cookie")]
+struct MakeCookie {
+    #[structopt(short)]
+    s: String,
+
+    #[structopt(subcommand, parse(from_occurrences))]
+    cmd: Command,
+}
+
+#[derive(StructOpt, Debug)]
+enum Command {
+    #[structopt(name = "pound")]
+    /// Pound acorns into flour for cookie dough.
+    Pound { acorns: u32 },
+
+    Sparkle {
+        #[structopt(short)]
+        color: String,
+    },
+}
+
+fn main() {
+    let opt = MakeCookie::from_args();
+    println!("{:?}", opt);
+}
diff --git a/structopt/tests/ui/subcommand_and_parse.stderr b/structopt/tests/ui/subcommand_and_parse.stderr
new file mode 100644
index 0000000..4070056
--- /dev/null
+++ b/structopt/tests/ui/subcommand_and_parse.stderr
@@ -0,0 +1,5 @@
+error: parse attribute is not allowed for subcommand
+  --> $DIR/subcommand_and_parse.rs:17:29
+   |
+17 |     #[structopt(subcommand, parse(from_occurrences))]
+   |                             ^^^^^
diff --git a/structopt/tests/ui/subcommand_opt_opt.rs b/structopt/tests/ui/subcommand_opt_opt.rs
new file mode 100644
index 0000000..1dd84e5
--- /dev/null
+++ b/structopt/tests/ui/subcommand_opt_opt.rs
@@ -0,0 +1,36 @@
+// Copyright 2018 Guillaume Pinot (@TeXitoi) <texitoi@texitoi.eu>
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use structopt::StructOpt;
+
+#[derive(StructOpt, Debug)]
+#[structopt(name = "make-cookie")]
+struct MakeCookie {
+    #[structopt(short)]
+    s: String,
+
+    #[structopt(subcommand)]
+    cmd: Option<Option<Command>>,
+}
+
+#[derive(StructOpt, Debug)]
+enum Command {
+    #[structopt(name = "pound")]
+    /// Pound acorns into flour for cookie dough.
+    Pound { acorns: u32 },
+
+    Sparkle {
+        #[structopt(short)]
+        color: String,
+    },
+}
+
+fn main() {
+    let opt = MakeCookie::from_args();
+    println!("{:?}", opt);
+}
diff --git a/structopt/tests/ui/subcommand_opt_opt.stderr b/structopt/tests/ui/subcommand_opt_opt.stderr
new file mode 100644
index 0000000..daad02f
--- /dev/null
+++ b/structopt/tests/ui/subcommand_opt_opt.stderr
@@ -0,0 +1,5 @@
+error: Option<Option<T>> type is not allowed for subcommand
+  --> $DIR/subcommand_opt_opt.rs:18:10
+   |
+18 |     cmd: Option<Option<Command>>,
+   |          ^^^^^^
diff --git a/structopt/tests/ui/subcommand_opt_vec.rs b/structopt/tests/ui/subcommand_opt_vec.rs
new file mode 100644
index 0000000..17bffbf
--- /dev/null
+++ b/structopt/tests/ui/subcommand_opt_vec.rs
@@ -0,0 +1,36 @@
+// Copyright 2018 Guillaume Pinot (@TeXitoi) <texitoi@texitoi.eu>
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use structopt::StructOpt;
+
+#[derive(StructOpt, Debug)]
+#[structopt(name = "make-cookie")]
+struct MakeCookie {
+    #[structopt(short)]
+    s: String,
+
+    #[structopt(subcommand)]
+    cmd: Option<Vec<Command>>,
+}
+
+#[derive(StructOpt, Debug)]
+enum Command {
+    #[structopt(name = "pound")]
+    /// Pound acorns into flour for cookie dough.
+    Pound { acorns: u32 },
+
+    Sparkle {
+        #[structopt(short)]
+        color: String,
+    },
+}
+
+fn main() {
+    let opt = MakeCookie::from_args();
+    println!("{:?}", opt);
+}
diff --git a/structopt/tests/ui/subcommand_opt_vec.stderr b/structopt/tests/ui/subcommand_opt_vec.stderr
new file mode 100644
index 0000000..a9833a6
--- /dev/null
+++ b/structopt/tests/ui/subcommand_opt_vec.stderr
@@ -0,0 +1,5 @@
+error: Option<Vec<T>> type is not allowed for subcommand
+  --> $DIR/subcommand_opt_vec.rs:18:10
+   |
+18 |     cmd: Option<Vec<Command>>,
+   |          ^^^^^^
diff --git a/structopt/tests/ui/tuple_struct.rs b/structopt/tests/ui/tuple_struct.rs
new file mode 100644
index 0000000..af9b1d5
--- /dev/null
+++ b/structopt/tests/ui/tuple_struct.rs
@@ -0,0 +1,18 @@
+// Copyright 2018 Guillaume Pinot (@TeXitoi) <texitoi@texitoi.eu>
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use structopt::StructOpt;
+
+#[derive(StructOpt, Debug)]
+#[structopt(name = "basic")]
+struct Opt(u32);
+
+fn main() {
+    let opt = Opt::from_args();
+    println!("{:?}", opt);
+}
diff --git a/structopt/tests/ui/tuple_struct.stderr b/structopt/tests/ui/tuple_struct.stderr
new file mode 100644
index 0000000..9f2876f
--- /dev/null
+++ b/structopt/tests/ui/tuple_struct.stderr
@@ -0,0 +1,5 @@
+error: structopt only supports non-tuple structs and enums
+  --> $DIR/tuple_struct.rs:11:10
+   |
+11 | #[derive(StructOpt, Debug)]
+   |          ^^^^^^^^^