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// Tests that a suggestion is issued for type mismatch errors when a
// 1-tuple is expected and a parenthesized expression of non-tuple
// type is supplied.
fn foo<T>(_t: (T,)) {}
struct S { _s: (String,) }
fn main() {
let _x: (i32,) = (5);
//~^ ERROR: mismatched types [E0308]
//~| HELP: use a trailing comma to create a tuple with one element
foo((Some(3)));
//~^ ERROR: mismatched types [E0308]
//~| HELP: use a trailing comma to create a tuple with one element
let _s = S { _s: ("abc".to_string()) };
//~^ ERROR: mismatched types [E0308]
//~| HELP: use a trailing comma to create a tuple with one element
// Do not issue the suggestion if the found type is already a tuple.
let t = (1, 2);
let _x: (i32,) = (t);
//~^ ERROR: mismatched types [E0308]
}
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