Auto merge of #73190 - Dylan-DPC:rollup-9wbyh4y, r=Dylan-DPC

Rollup of 8 pull requests

Successful merges:

 - #72417 (Remove `RawVec::reserve_in_place`.)
 - #73098 (Add Item::is_fake for rustdoc)
 - #73122 (Resolve E0584 conflict)
 - #73123 (Clean up E0647 explanation)
 - #73133 (Enforce unwind invariants)
 - #73148 (Fix a typo (size of the size))
 - #73149 (typo: awailable -> available)
 - #73161 (Add mailmap entry)

Failed merges:

r? @ghost

3 files changed, 28 insertions, 2 deletions

diff --git a/src/librustc_error_codes/error_codes/E0583.md b/src/librustc_error_codes/error_codes/E0583.md
index 2dcbbf88556..701900bb0cd 100644
--- a/src/librustc_error_codes/error_codes/E0583.md
+++ b/src/librustc_error_codes/error_codes/E0583.md
@@ -2,7 +2,7 @@ A file wasn't found for an out-of-line module.
 
 Erroneous code example:
 
-```ignore (compile_fail not working here; see Issue #43707)
+```compile_fail,E0583
 mod file_that_doesnt_exist; // error: file not found for module
 
 fn main() {}
diff --git a/src/librustc_error_codes/error_codes/E0647.md b/src/librustc_error_codes/error_codes/E0647.md
index 131db38c00d..8ca6e777f30 100644
--- a/src/librustc_error_codes/error_codes/E0647.md
+++ b/src/librustc_error_codes/error_codes/E0647.md
@@ -1,4 +1,5 @@
-It is not possible to define `start` with a where clause.
+The `start` function was defined with a where clause.
+
 Erroneous code example:
 
 ```compile_fail,E0647
diff --git a/src/librustc_error_codes/error_codes/E0761.md b/src/librustc_error_codes/error_codes/E0761.md
new file mode 100644
index 00000000000..c01574e413c
--- /dev/null
+++ b/src/librustc_error_codes/error_codes/E0761.md
@@ -0,0 +1,25 @@
+Multiple candidate files were found for an out-of-line module.
+
+Erroneous code example:
+
+```rust
+// file: ambiguous_module/mod.rs
+
+fn foo() {}
+```
+
+```rust
+// file: ambiguous_module.rs
+
+fn foo() {}
+```
+
+```ignore (multiple source files required for compile_fail)
+mod ambiguous_module; // error: file for module `ambiguous_module`
+                      // found at both ambiguous_module.rs and
+                      // ambiguous_module.rs/mod.rs
+
+fn main() {}
+```
+
+Please remove this ambiguity by deleting/renaming one of the candidate files.