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20 lines
434 B
Rust
20 lines
434 B
Rust
#![feature(tuple_trait)]
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fn assert_is_tuple<T: std::marker::Tuple + ?Sized>() {}
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struct TupleStruct(i32, i32);
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fn from_param_env<T>() {
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assert_is_tuple::<T>();
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//~^ ERROR `T` is not a tuple
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}
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fn main() {
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assert_is_tuple::<i32>();
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//~^ ERROR `i32` is not a tuple
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assert_is_tuple::<(i32)>();
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//~^ ERROR `i32` is not a tuple
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assert_is_tuple::<TupleStruct>();
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//~^ ERROR `TupleStruct` is not a tuple
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}
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