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