error: expected identifier, found reserved identifier `_`
  --> $DIR/issue-62895.rs:4:5
   |
LL | mod _ {
   |     ^ expected identifier, found reserved identifier

error: expected identifier, found reserved identifier `_`
  --> $DIR/issue-62895.rs:6:5
   |
LL | mod _ {
   |     ^ expected identifier, found reserved identifier

error: missing `fn` for function definition
  --> $DIR/issue-62895.rs:7:4
   |
LL | pub    g() -> is
   |    ^^^^
   |
help: add `fn` here to parse `g` as a public function
   |
LL | pub fn g() -> is
   |     ++

error: expected item, found `;`
  --> $DIR/issue-62895.rs:10:9
   |
LL | (), w20);
   |         ^ help: remove this semicolon

error[E0412]: cannot find type `isizee` in this scope
  --> $DIR/issue-62895.rs:5:15
   |
LL | pub fn g() -> isizee {
   |               ^^^^^^ help: a builtin type with a similar name exists: `isize`

error[E0308]: mismatched types
  --> $DIR/issue-62895.rs:3:11
   |
LL | fn v() -> isize {
   |    -      ^^^^^ expected `isize`, found `()`
   |    |
   |    implicitly returns `()` as its body has no tail or `return` expression

error: aborting due to 6 previous errors

Some errors have detailed explanations: E0308, E0412.
For more information about an error, try `rustc --explain E0308`.