Fix malformed suggestion for repeated maybe unsized bounds
This commit is contained in:
Gurinder Singh
parent
b1de36ff34
commit
e13eb37eeb
4 changed files with 295 additions and 29 deletions
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// Regression test for #127441
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// Tests that we make the correct suggestion
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// in case there are more than one `?Sized`
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// bounds on a function parameter
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use std::fmt::Debug;
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fn foo1<T: ?Sized>(a: T) {}
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//~^ ERROR he size for values of type `T` cannot be known at compilation time
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fn foo2<T: ?Sized + ?Sized>(a: T) {}
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//~^ ERROR type parameter has more than one relaxed default bound, only one is supported
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//~| ERROR the size for values of type `T` cannot be known at compilation time
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fn foo3<T: ?Sized + ?Sized + Debug>(a: T) {}
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//~^ ERROR type parameter has more than one relaxed default bound, only one is supported
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//~| ERROR he size for values of type `T` cannot be known at compilation time
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fn foo4<T: ?Sized + Debug + ?Sized >(a: T) {}
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//~^ ERROR type parameter has more than one relaxed default bound, only one is supported
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//~| ERROR the size for values of type `T` cannot be known at compilation time
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fn foo5(_: impl ?Sized) {}
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//~^ ERROR the size for values of type `impl ?Sized` cannot be known at compilation time
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fn foo6(_: impl ?Sized + ?Sized) {}
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//~^ ERROR type parameter has more than one relaxed default bound, only one is supported
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//~| ERROR the size for values of type `impl ?Sized + ?Sized` cannot be known at compilation tim
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fn foo7(_: impl ?Sized + ?Sized + Debug) {}
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//~^ ERROR type parameter has more than one relaxed default bound, only one is supported
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//~| ERROR the size for values of type `impl ?Sized + ?Sized + Debug` cannot be known at compilation time
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fn foo8(_: impl ?Sized + Debug + ?Sized ) {}
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//~^ ERROR type parameter has more than one relaxed default bound, only one is supported
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//~| ERROR the size for values of type `impl ?Sized + Debug + ?Sized` cannot be known at compilation time
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fn main() {}
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error[E0203]: type parameter has more than one relaxed default bound, only one is supported
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--> $DIR/bad-suggestionf-for-repeated-unsized-bound-127441.rs:12:12
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LL | fn foo2<T: ?Sized + ?Sized>(a: T) {}
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| ^^^^^^ ^^^^^^
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error[E0203]: type parameter has more than one relaxed default bound, only one is supported
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--> $DIR/bad-suggestionf-for-repeated-unsized-bound-127441.rs:16:12
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LL | fn foo3<T: ?Sized + ?Sized + Debug>(a: T) {}
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| ^^^^^^ ^^^^^^
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error[E0203]: type parameter has more than one relaxed default bound, only one is supported
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--> $DIR/bad-suggestionf-for-repeated-unsized-bound-127441.rs:20:12
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LL | fn foo4<T: ?Sized + Debug + ?Sized >(a: T) {}
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| ^^^^^^ ^^^^^^
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error[E0203]: type parameter has more than one relaxed default bound, only one is supported
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--> $DIR/bad-suggestionf-for-repeated-unsized-bound-127441.rs:27:17
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LL | fn foo6(_: impl ?Sized + ?Sized) {}
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| ^^^^^^ ^^^^^^
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error[E0203]: type parameter has more than one relaxed default bound, only one is supported
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--> $DIR/bad-suggestionf-for-repeated-unsized-bound-127441.rs:31:17
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LL | fn foo7(_: impl ?Sized + ?Sized + Debug) {}
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| ^^^^^^ ^^^^^^
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error[E0203]: type parameter has more than one relaxed default bound, only one is supported
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--> $DIR/bad-suggestionf-for-repeated-unsized-bound-127441.rs:35:17
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LL | fn foo8(_: impl ?Sized + Debug + ?Sized ) {}
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| ^^^^^^ ^^^^^^
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error[E0277]: the size for values of type `T` cannot be known at compilation time
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--> $DIR/bad-suggestionf-for-repeated-unsized-bound-127441.rs:9:20
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LL | fn foo1<T: ?Sized>(a: T) {}
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| - ^ doesn't have a size known at compile-time
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| |
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| this type parameter needs to be `Sized`
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= help: unsized fn params are gated as an unstable feature
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help: consider removing the `?Sized` bound to make the type parameter `Sized`
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LL - fn foo1<T: ?Sized>(a: T) {}
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LL + fn foo1<T>(a: T) {}
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help: function arguments must have a statically known size, borrowed types always have a known size
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LL | fn foo1<T: ?Sized>(a: &T) {}
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| +
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error[E0277]: the size for values of type `T` cannot be known at compilation time
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--> $DIR/bad-suggestionf-for-repeated-unsized-bound-127441.rs:12:29
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LL | fn foo2<T: ?Sized + ?Sized>(a: T) {}
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| - ^ doesn't have a size known at compile-time
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| |
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| this type parameter needs to be `Sized`
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= help: unsized fn params are gated as an unstable feature
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help: consider removing the `?Sized` bound to make the type parameter `Sized`
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LL - fn foo2<T: ?Sized + ?Sized>(a: T) {}
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LL + fn foo2<T>(a: T) {}
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help: function arguments must have a statically known size, borrowed types always have a known size
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LL | fn foo2<T: ?Sized + ?Sized>(a: &T) {}
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| +
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error[E0277]: the size for values of type `T` cannot be known at compilation time
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--> $DIR/bad-suggestionf-for-repeated-unsized-bound-127441.rs:16:37
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LL | fn foo3<T: ?Sized + ?Sized + Debug>(a: T) {}
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| - ^ doesn't have a size known at compile-time
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| |
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| this type parameter needs to be `Sized`
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= help: unsized fn params are gated as an unstable feature
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help: consider restricting type parameters
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LL - fn foo3<T: ?Sized + ?Sized + Debug>(a: T) {}
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LL + fn foo3<T: Debug>(a: T) {}
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help: function arguments must have a statically known size, borrowed types always have a known size
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LL | fn foo3<T: ?Sized + ?Sized + Debug>(a: &T) {}
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| +
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error[E0277]: the size for values of type `T` cannot be known at compilation time
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--> $DIR/bad-suggestionf-for-repeated-unsized-bound-127441.rs:20:38
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LL | fn foo4<T: ?Sized + Debug + ?Sized >(a: T) {}
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| - ^ doesn't have a size known at compile-time
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| |
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| this type parameter needs to be `Sized`
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= help: unsized fn params are gated as an unstable feature
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help: consider restricting type parameters
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LL - fn foo4<T: ?Sized + Debug + ?Sized >(a: T) {}
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LL + fn foo4<T: Debug >(a: T) {}
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help: function arguments must have a statically known size, borrowed types always have a known size
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LL | fn foo4<T: ?Sized + Debug + ?Sized >(a: &T) {}
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| +
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error[E0277]: the size for values of type `impl ?Sized` cannot be known at compilation time
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--> $DIR/bad-suggestionf-for-repeated-unsized-bound-127441.rs:24:9
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LL | fn foo5(_: impl ?Sized) {}
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| ^ ----------- this type parameter needs to be `Sized`
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| |
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| doesn't have a size known at compile-time
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= help: unsized fn params are gated as an unstable feature
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help: consider replacing `?Sized` with `Sized`
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LL - fn foo5(_: impl ?Sized) {}
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LL + fn foo5(_: impl Sized) {}
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help: function arguments must have a statically known size, borrowed types always have a known size
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LL | fn foo5(_: &impl ?Sized) {}
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| +
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error[E0277]: the size for values of type `impl ?Sized + ?Sized` cannot be known at compilation time
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--> $DIR/bad-suggestionf-for-repeated-unsized-bound-127441.rs:27:9
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LL | fn foo6(_: impl ?Sized + ?Sized) {}
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| ^ -------------------- this type parameter needs to be `Sized`
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| |
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| doesn't have a size known at compile-time
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= help: unsized fn params are gated as an unstable feature
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help: consider restricting type parameters
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LL - fn foo6(_: impl ?Sized + ?Sized) {}
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LL + fn foo6(_: impl Sized) {}
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help: function arguments must have a statically known size, borrowed types always have a known size
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LL | fn foo6(_: &impl ?Sized + ?Sized) {}
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| +
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error[E0277]: the size for values of type `impl ?Sized + ?Sized + Debug` cannot be known at compilation time
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--> $DIR/bad-suggestionf-for-repeated-unsized-bound-127441.rs:31:9
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LL | fn foo7(_: impl ?Sized + ?Sized + Debug) {}
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| ^ ---------------------------- this type parameter needs to be `Sized`
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| |
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| doesn't have a size known at compile-time
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= help: unsized fn params are gated as an unstable feature
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help: consider restricting type parameters
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LL - fn foo7(_: impl ?Sized + ?Sized + Debug) {}
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LL + fn foo7(_: impl Debug) {}
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help: function arguments must have a statically known size, borrowed types always have a known size
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LL | fn foo7(_: &impl ?Sized + ?Sized + Debug) {}
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| +
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error[E0277]: the size for values of type `impl ?Sized + Debug + ?Sized` cannot be known at compilation time
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--> $DIR/bad-suggestionf-for-repeated-unsized-bound-127441.rs:35:9
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LL | fn foo8(_: impl ?Sized + Debug + ?Sized ) {}
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| ^ ---------------------------- this type parameter needs to be `Sized`
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| |
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| doesn't have a size known at compile-time
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= help: unsized fn params are gated as an unstable feature
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help: consider restricting type parameters
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LL - fn foo8(_: impl ?Sized + Debug + ?Sized ) {}
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LL + fn foo8(_: impl Debug ) {}
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help: function arguments must have a statically known size, borrowed types always have a known size
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LL | fn foo8(_: &impl ?Sized + Debug + ?Sized ) {}
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| +
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error: aborting due to 14 previous errors
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Some errors have detailed explanations: E0203, E0277.
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For more information about an error, try `rustc --explain E0203`.
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