1 files changed, 110 insertions, 0 deletions
diff --git a/syn/tests/debug/mod.rs b/syn/tests/debug/mod.rs
new file mode 100644
index 0000000..9c80e2c
--- /dev/null
+++ b/syn/tests/debug/mod.rs
@@ -0,0 +1,110 @@
+mod gen;
+
+use proc_macro2::{Ident, Literal, TokenStream};
+use ref_cast::RefCast;
+use std::fmt::{self, Debug};
+use std::ops::Deref;
+use syn::punctuated::Punctuated;
+
+#[derive(RefCast)]
+#[repr(transparent)]
+pub struct Lite<T: ?Sized> {
+    value: T,
+}
+
+#[allow(non_snake_case)]
+pub fn Lite<T: ?Sized>(value: &T) -> &Lite<T> {
+    Lite::ref_cast(value)
+}
+
+impl<T: ?Sized> Deref for Lite<T> {
+    type Target = T;
+
+    fn deref(&self) -> &Self::Target {
+        &self.value
+    }
+}
+
+impl Debug for Lite<bool> {
+    fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+        write!(formatter, "{}", self.value)
+    }
+}
+
+impl Debug for Lite<u32> {
+    fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+        write!(formatter, "{}", self.value)
+    }
+}
+
+impl Debug for Lite<usize> {
+    fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+        write!(formatter, "{}", self.value)
+    }
+}
+
+impl Debug for Lite<String> {
+    fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+        write!(formatter, "{:?}", self.value)
+    }
+}
+
+impl Debug for Lite<Ident> {
+    fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+        write!(formatter, "{:?}", self.value.to_string())
+    }
+}
+
+impl Debug for Lite<Literal> {
+    fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+        write!(formatter, "{}", self.value)
+    }
+}
+
+impl Debug for Lite<TokenStream> {
+    fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+        write!(formatter, "`{}`", self.value)
+    }
+}
+
+impl<'a, T> Debug for Lite<&'a T>
+where
+    Lite<T>: Debug,
+{
+    fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+        Debug::fmt(Lite(&*self.value), formatter)
+    }
+}
+
+impl<T> Debug for Lite<Box<T>>
+where
+    Lite<T>: Debug,
+{
+    fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+        Debug::fmt(Lite(&*self.value), formatter)
+    }
+}
+
+impl<T> Debug for Lite<Vec<T>>
+where
+    Lite<T>: Debug,
+{
+    fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+        formatter
+            .debug_list()
+            .entries(self.value.iter().map(Lite))
+            .finish()
+    }
+}
+
+impl<T, P> Debug for Lite<Punctuated<T, P>>
+where
+    Lite<T>: Debug,
+{
+    fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+        formatter
+            .debug_list()
+            .entries(self.value.iter().map(Lite))
+            .finish()
+    }
+}