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Gate fallback via
#![feature(never_type_fallback)]
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Original file line number | Diff line number | Diff line change |
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@@ -444,6 +444,7 @@ symbols! { | |
negate_unsigned, | ||
never, | ||
never_type, | ||
never_type_fallback, | ||
new, | ||
next, | ||
__next, | ||
|
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4 changes: 2 additions & 2 deletions
4
src/test/ui/associated-types/associated-types-ICE-when-projecting-out-of-err.stderr
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Original file line number | Diff line number | Diff line change |
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@@ -1,5 +1,5 @@ | ||
// check-pass | ||
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#![feature(never_type_fallback)] | ||
#![allow(unreachable_code)] | ||
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use std::error::Error; | ||
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12 changes: 12 additions & 0 deletions
12
src/test/ui/never_type/feature-gate-never_type_fallback.rs
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@@ -0,0 +1,12 @@ | ||
// This is a feature gate test for `never_type_fallback`. | ||
// It works by using a scenario where the type fall backs to `()` rather than ´!` | ||
// in the case where `#![feature(never_type_fallback)]` would change it to `!`. | ||
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fn main() {} | ||
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trait T {} | ||
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fn should_ret_unit() -> impl T { | ||
//~^ ERROR the trait bound `(): T` is not satisfied | ||
panic!() | ||
} |
11 changes: 11 additions & 0 deletions
11
src/test/ui/never_type/feature-gate-never_type_fallback.stderr
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,11 @@ | ||
error[E0277]: the trait bound `(): T` is not satisfied | ||
--> $DIR/feature-gate-never_type_fallback.rs:9:25 | ||
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LL | fn should_ret_unit() -> impl T { | ||
| ^^^^^^ the trait `T` is not implemented for `()` | ||
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= note: the return type of a function must have a statically known size | ||
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error: aborting due to previous error | ||
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For more information about this error, try `rustc --explain E0277`. |
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Original file line number | Diff line number | Diff line change |
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@@ -1,3 +1,4 @@ | ||
#![feature(never_type_fallback)] | ||
#![feature(exhaustive_patterns)] | ||
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#![allow(unreachable_code)] | ||
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