From 0d6da78b06e0fa4e1df1fe6795f3e17f0320071a Mon Sep 17 00:00:00 2001 From: Michael Goulet Date: Thu, 15 Jun 2023 03:18:12 +0000 Subject: [PATCH] Always register sized obligation for argument --- compiler/rustc_hir_typeck/src/check.rs | 5 +---- .../closures/cannot-call-unsized-via-ptr-2.rs | 11 ++++++++++ .../cannot-call-unsized-via-ptr-2.stderr | 21 +++++++++++++++++++ .../closures/cannot-call-unsized-via-ptr.rs | 10 +++++++++ .../cannot-call-unsized-via-ptr.stderr | 12 +++++++++++ tests/ui/issues/issue-5883.rs | 2 +- tests/ui/issues/issue-5883.stderr | 18 +--------------- 7 files changed, 57 insertions(+), 22 deletions(-) create mode 100644 tests/ui/closures/cannot-call-unsized-via-ptr-2.rs create mode 100644 tests/ui/closures/cannot-call-unsized-via-ptr-2.stderr create mode 100644 tests/ui/closures/cannot-call-unsized-via-ptr.rs create mode 100644 tests/ui/closures/cannot-call-unsized-via-ptr.stderr diff --git a/compiler/rustc_hir_typeck/src/check.rs b/compiler/rustc_hir_typeck/src/check.rs index 69ccbf0b58ff3..0a1b639af5157 100644 --- a/compiler/rustc_hir_typeck/src/check.rs +++ b/compiler/rustc_hir_typeck/src/check.rs @@ -92,10 +92,7 @@ pub(super) fn check_fn<'a, 'tcx>( fcx.check_pat_top(¶m.pat, param_ty, ty_span, None); // Check that argument is Sized. - // The check for a non-trivial pattern is a hack to avoid duplicate warnings - // for simple cases like `fn foo(x: Trait)`, - // where we would error once on the parameter as a whole, and once on the binding `x`. - if param.pat.simple_ident().is_none() && !params_can_be_unsized { + if !params_can_be_unsized { fcx.require_type_is_sized( param_ty, param.pat.span, diff --git a/tests/ui/closures/cannot-call-unsized-via-ptr-2.rs b/tests/ui/closures/cannot-call-unsized-via-ptr-2.rs new file mode 100644 index 0000000000000..2d8565517e897 --- /dev/null +++ b/tests/ui/closures/cannot-call-unsized-via-ptr-2.rs @@ -0,0 +1,11 @@ +#![feature(unsized_fn_params)] + +fn main() { + // CoerceMany "LUB" + let f = if true { |_a| {} } else { |_b| {} }; + //~^ ERROR the size for values of type `[u8]` cannot be known at compilation time + //~| ERROR the size for values of type `[u8]` cannot be known at compilation time + + let slice: Box<[u8]> = Box::new([1; 8]); + f(*slice); +} diff --git a/tests/ui/closures/cannot-call-unsized-via-ptr-2.stderr b/tests/ui/closures/cannot-call-unsized-via-ptr-2.stderr new file mode 100644 index 0000000000000..d88b84365dfae --- /dev/null +++ b/tests/ui/closures/cannot-call-unsized-via-ptr-2.stderr @@ -0,0 +1,21 @@ +error[E0277]: the size for values of type `[u8]` cannot be known at compilation time + --> $DIR/cannot-call-unsized-via-ptr-2.rs:5:24 + | +LL | let f = if true { |_a| {} } else { |_b| {} }; + | ^^ doesn't have a size known at compile-time + | + = help: the trait `Sized` is not implemented for `[u8]` + = note: all function arguments must have a statically known size + +error[E0277]: the size for values of type `[u8]` cannot be known at compilation time + --> $DIR/cannot-call-unsized-via-ptr-2.rs:5:41 + | +LL | let f = if true { |_a| {} } else { |_b| {} }; + | ^^ doesn't have a size known at compile-time + | + = help: the trait `Sized` is not implemented for `[u8]` + = note: all function arguments must have a statically known size + +error: aborting due to 2 previous errors + +For more information about this error, try `rustc --explain E0277`. diff --git a/tests/ui/closures/cannot-call-unsized-via-ptr.rs b/tests/ui/closures/cannot-call-unsized-via-ptr.rs new file mode 100644 index 0000000000000..5ce4650b0333c --- /dev/null +++ b/tests/ui/closures/cannot-call-unsized-via-ptr.rs @@ -0,0 +1,10 @@ +#![feature(unsized_fn_params)] + +fn main() { + // Simple coercion + let f: fn([u8]) = |_result| {}; + //~^ ERROR the size for values of type `[u8]` cannot be known at compilation time + + let slice: Box<[u8]> = Box::new([1; 8]); + f(*slice); +} diff --git a/tests/ui/closures/cannot-call-unsized-via-ptr.stderr b/tests/ui/closures/cannot-call-unsized-via-ptr.stderr new file mode 100644 index 0000000000000..9ecc66d5ce897 --- /dev/null +++ b/tests/ui/closures/cannot-call-unsized-via-ptr.stderr @@ -0,0 +1,12 @@ +error[E0277]: the size for values of type `[u8]` cannot be known at compilation time + --> $DIR/cannot-call-unsized-via-ptr.rs:5:24 + | +LL | let f: fn([u8]) = |_result| {}; + | ^^^^^^^ doesn't have a size known at compile-time + | + = help: the trait `Sized` is not implemented for `[u8]` + = note: all function arguments must have a statically known size + +error: aborting due to previous error + +For more information about this error, try `rustc --explain E0277`. diff --git a/tests/ui/issues/issue-5883.rs b/tests/ui/issues/issue-5883.rs index 82866b355573c..f9dd2c54d997f 100644 --- a/tests/ui/issues/issue-5883.rs +++ b/tests/ui/issues/issue-5883.rs @@ -6,7 +6,7 @@ struct Struct { fn new_struct( r: dyn A + 'static //~ ERROR the size for values of type -) -> Struct { //~ ERROR the size for values of type +) -> Struct { Struct { r: r } } diff --git a/tests/ui/issues/issue-5883.stderr b/tests/ui/issues/issue-5883.stderr index ffff403e0d465..a3e2531b5caa4 100644 --- a/tests/ui/issues/issue-5883.stderr +++ b/tests/ui/issues/issue-5883.stderr @@ -15,22 +15,6 @@ help: function arguments must have a statically known size, borrowed types alway LL | r: &dyn A + 'static | + -error[E0277]: the size for values of type `(dyn A + 'static)` cannot be known at compilation time - --> $DIR/issue-5883.rs:9:6 - | -LL | ) -> Struct { - | ^^^^^^ doesn't have a size known at compile-time -LL | Struct { r: r } - | --------------- this returned value is of type `Struct` - | - = help: within `Struct`, the trait `Sized` is not implemented for `(dyn A + 'static)` -note: required because it appears within the type `Struct` - --> $DIR/issue-5883.rs:3:8 - | -LL | struct Struct { - | ^^^^^^ - = note: the return type of a function must have a statically known size - -error: aborting due to 2 previous errors +error: aborting due to previous error For more information about this error, try `rustc --explain E0277`.