error[E0214]: parenthesized type parameters may only be used with a `Fn` trait
  --> $DIR/issue-23589.rs:2:12
   |
LL |     let v: Vec(&str) = vec!['1', '2'];
   |            ^^^^^^^^^ only `Fn` traits may use parentheses
   |
help: use angle brackets instead
   |
LL |     let v: Vec<&str> = vec!['1', '2'];
   |               ~    ~

error[E0308]: mismatched types
  --> $DIR/issue-23589.rs:2:29
   |
LL |     let v: Vec(&str) = vec!['1', '2'];
   |                             ^^^ expected `&str`, found `char`
   |
help: if you meant to write a `str` literal, use double quotes
   |
LL |     let v: Vec(&str) = vec!["1", '2'];
   |                             ~ ~

error: aborting due to 2 previous errors

Some errors have detailed explanations: E0214, E0308.
For more information about an error, try `rustc --explain E0214`.