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

2 files changed, 37 insertions, 0 deletions

diff --git a/syn/examples/heapsize/example/Cargo.toml b/syn/examples/heapsize/example/Cargo.toml
new file mode 100644
index 0000000..85c7699
--- /dev/null
+++ b/syn/examples/heapsize/example/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "heapsize_example"
+version = "0.0.0"
+authors = ["David Tolnay <dtolnay@gmail.com>"]
+edition = "2018"
+publish = false
+
+[dependencies]
+heapsize = { path = "../heapsize" }
diff --git a/syn/examples/heapsize/example/src/main.rs b/syn/examples/heapsize/example/src/main.rs
new file mode 100644
index 0000000..9332b11
--- /dev/null
+++ b/syn/examples/heapsize/example/src/main.rs
@@ -0,0 +1,28 @@
+use heapsize::HeapSize;
+
+#[derive(HeapSize)]
+struct Demo<'a, T: ?Sized> {
+    a: Box<T>,
+    b: u8,
+    c: &'a str,
+    d: String,
+}
+
+fn main() {
+    let demo = Demo {
+        a: b"bytestring".to_vec().into_boxed_slice(),
+        b: 255,
+        c: "&'static str",
+        d: "String".to_owned(),
+    };
+
+    // 10 + 0 + 0 + 6 = 16
+    println!(
+        "heap size = {} + {} + {} + {} = {}",
+        demo.a.heap_size_of_children(),
+        demo.b.heap_size_of_children(),
+        demo.c.heap_size_of_children(),
+        demo.d.heap_size_of_children(),
+        demo.heap_size_of_children()
+    );
+}