1 files changed, 95 insertions, 0 deletions
diff --git a/tests/ui/lint/unused/unused-doc-comments-edge-cases.stderr b/tests/ui/lint/unused/unused-doc-comments-edge-cases.stderr
new file mode 100644
index 000000000..078b780d8
--- /dev/null
+++ b/tests/ui/lint/unused/unused-doc-comments-edge-cases.stderr
@@ -0,0 +1,95 @@
+error: expected expression, found keyword `else`
+  --> $DIR/unused-doc-comments-edge-cases.rs:17:5
+   |
+LL |     else {
+   |     ^^^^ expected expression
+
+error[E0658]: attributes on expressions are experimental
+  --> $DIR/unused-doc-comments-edge-cases.rs:23:5
+   |
+LL |     /// useless doc comment
+   |     ^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
+   = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+   = help: `///` is for documentation comments. For a plain comment, use `//`.
+
+error: unused doc comment
+  --> $DIR/unused-doc-comments-edge-cases.rs:6:9
+   |
+LL |         /// useless doc comment
+   |         ^^^^^^^^^^^^^^^^^^^^^^^
+LL |
+LL |         _ => false,
+   |         ---------- rustdoc does not generate documentation for match arms
+   |
+   = help: use `//` for a plain comment
+note: the lint level is defined here
+  --> $DIR/unused-doc-comments-edge-cases.rs:1:9
+   |
+LL | #![deny(unused_doc_comments)]
+   |         ^^^^^^^^^^^^^^^^^^^
+
+error: unused doc comment
+  --> $DIR/unused-doc-comments-edge-cases.rs:23:5
+   |
+LL |     /// useless doc comment
+   |     ^^^^^^^^^^^^^^^^^^^^^^^
+...
+LL |     num == 3
+   |     --- rustdoc does not generate documentation for expressions
+   |
+   = help: use `//` for a plain comment
+
+error: unused doc comment
+  --> $DIR/unused-doc-comments-edge-cases.rs:29:27
+   |
+LL | fn doc_comment_on_generic<#[doc = "x"] T>(val: T) {}
+   |                           ^^^^^^^^^^^^ - rustdoc does not generate documentation for generic parameters
+   |
+   = help: use `//` for a plain comment
+
+error: unused doc comment
+  --> $DIR/unused-doc-comments-edge-cases.rs:33:5
+   |
+LL |       /// unused doc comment
+   |       ^^^^^^^^^^^^^^^^^^^^^^
+LL |
+LL | /     {
+LL | |         let x = 12;
+LL | |     }
+   | |_____- rustdoc does not generate documentation for expressions
+   |
+   = help: use `//` for a plain comment
+
+error: unused doc comment
+  --> $DIR/unused-doc-comments-edge-cases.rs:40:1
+   |
+LL |   /// unused doc comment
+   |   ^^^^^^^^^^^^^^^^^^^^^^
+LL |
+LL | / extern "C" {
+LL | |     fn foo();
+LL | | }
+   | |_- rustdoc does not generate documentation for extern blocks
+   |
+   = help: use `//` for a plain comment
+
+error[E0308]: mismatched types
+  --> $DIR/unused-doc-comments-edge-cases.rs:14:9
+   |
+LL | /     if num == 3 {
+LL | |         true
+   | |         ^^^^ expected `()`, found `bool`
+LL | |     }
+   | |_____- expected this to be `()`
+   |
+help: you might have meant to return this value
+   |
+LL |         return true;
+   |         ++++++     +
+
+error: aborting due to 8 previous errors
+
+Some errors have detailed explanations: E0308, E0658.
+For more information about an error, try `rustc --explain E0308`.