Rollup merge of rust-lang#122895 - matthiaskrgr:ice-tests-5xxxx-to-9x…

…xxx, r=fmease

add some ice tests 5xxxx to 9xxxx

  Fixes rust-lang#98842
  Fixes rust-lang#90691
  Fixes rust-lang#88421
  Fixes rust-lang#88212
  Fixes rust-lang#83056
  Fixes rust-lang#80125
  Fixes rust-lang#64784
  Fixes rust-lang#52334

tests/ui/associated-type-bounds/resolution-failure-building-vtable-representation-ice-90691.rs

@@ -0,0 +1,42 @@
+// ICE #90691 Encountered error `Unimplemented` selecting  ...
+//@ build-pass
+// issue: rust-lang/rust#90691
+
+trait TError: std::fmt::Debug {}
+impl TError for () {}
+
+trait SuperTrait {
+    type Error;
+}
+
+trait Trait: SuperTrait<Error: TError> {}
+
+impl<T> Trait for T
+where
+    T: SuperTrait,
+    <T as SuperTrait>::Error: TError,
+{
+}
+
+struct SomeTrait<S>(S);
+struct BoxedTrait(Box<dyn Trait<Error = ()>>);
+
+impl<S: 'static> From<SomeTrait<S>> for BoxedTrait {
+    fn from(other: SomeTrait<S>) -> Self {
+        Self(Box::new(other))
+    }
+}
+
+impl<S> SuperTrait for SomeTrait<S> {
+    type Error = ();
+}
+
+impl From<()> for BoxedTrait {
+    fn from(c: ()) -> Self {
+        Self::from(SomeTrait(c))
+    }
+}
+
+fn main() {
+    let _: BoxedTrait = ().into();
+}

tests/ui/const-generics/generic_const_exprs/failed-to-normalize-ice-issue-88421.rs

@@ -0,0 +1,36 @@
+//@ check-pass
+// issue: rust-lang/rust#88421
+#![feature(adt_const_params)]
+#![feature(generic_const_exprs)]
+#![allow(incomplete_features)]
+
+use std::ops::Index;
+
+pub struct CellPossibilities;
+
+pub enum CellState<const SQUARE_SIZE: usize> {
+    Empty(Option<CellPossibilities>),
+}
+
+pub struct Sudoku<const SQUARE_SIZE: usize>;
+
+impl<const SQUARE_SIZE: usize> Sudoku<SQUARE_SIZE>where
+    [CellState<SQUARE_SIZE>; SQUARE_SIZE * SQUARE_SIZE]: Sized,
+{
+    pub fn random() {
+        let CellState::Empty(_) = Self[()];
+    }
+}
+
+impl<const SQUARE_SIZE: usize> Index<()> for Sudoku<SQUARE_SIZE>
+where
+    [CellState<SQUARE_SIZE>; SQUARE_SIZE * SQUARE_SIZE]: Sized,
+{
+    type Output = CellState<SQUARE_SIZE>;
+
+    fn index(&self, _: ()) -> &Self::Output {
+        todo!()
+    }
+}
+
+pub fn main() {}

tests/ui/consts/ice-bad-input-type-for-cast-83056.rs

@@ -0,0 +1,7 @@
+// #83056 ICE "bad input type for cast"
+// issue: rust-lang/rust#83056
+
+struct S([bool; f as usize]);
+fn f() -> T {}
+//~^ ERROR cannot find type `T` in this scope
+pub fn main() {}

tests/ui/consts/ice-bad-input-type-for-cast-83056.stderr

@@ -0,0 +1,20 @@
+error[E0412]: cannot find type `T` in this scope
+  --> $DIR/ice-bad-input-type-for-cast-83056.rs:5:11
+   |
+LL | struct S([bool; f as usize]);
+   | ----------------------------- similarly named struct `S` defined here
+LL | fn f() -> T {}
+   |           ^
+   |
+help: a struct with a similar name exists
+   |
+LL | fn f() -> S {}
+   |           ~
+help: you might be missing a type parameter
+   |
+LL | fn f<T>() -> T {}
+   |     +++
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0412`.

tests/ui/extern/extern-C-non-FFI-safe-arg-ice-52334.rs

@@ -0,0 +1,13 @@
+// test for #52334 ICE when casting extern "C" fn when it has a non-FFI-safe argument
+//@ check-pass
+// issue: rust-lang/rust#52334
+type Foo = extern "C" fn(::std::ffi::CStr);
+//~^ WARN `extern` fn uses type `[i8]`, which is not FFI-safe
+extern "C" {
+    fn meh(blah: Foo);
+    //~^ WARN `extern` block uses type `[i8]`, which is not FFI-safe
+}
+
+fn main() {
+    meh as usize;
+}

tests/ui/extern/extern-C-non-FFI-safe-arg-ice-52334.stderr

@@ -0,0 +1,22 @@
+warning: `extern` fn uses type `[i8]`, which is not FFI-safe
+  --> $DIR/extern-C-non-FFI-safe-arg-ice-52334.rs:4:12
+   |
+LL | type Foo = extern "C" fn(::std::ffi::CStr);
+   |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
+   |
+   = help: consider using a raw pointer instead
+   = note: slices have no C equivalent
+   = note: `#[warn(improper_ctypes_definitions)]` on by default
+
+warning: `extern` block uses type `[i8]`, which is not FFI-safe
+  --> $DIR/extern-C-non-FFI-safe-arg-ice-52334.rs:7:18
+   |
+LL |     fn meh(blah: Foo);
+   |                  ^^^ not FFI-safe
+   |
+   = help: consider using a raw pointer instead
+   = note: slices have no C equivalent
+   = note: `#[warn(improper_ctypes)]` on by default
+
+warning: 2 warnings emitted
+

tests/ui/extern/extern-C-str-arg-ice-80125.rs

@@ -0,0 +1,15 @@
+// issue: rust-lang/rust#80125
+//@ check-pass
+type ExternCallback = extern "C" fn(*const u8, u32, str);
+//~^ WARN `extern` fn uses type `str`, which is not FFI-safe
+
+pub struct Struct(ExternCallback);
+
+#[no_mangle]
+pub extern "C" fn register_something(bind: ExternCallback) -> Struct {
+//~^ WARN `extern` fn uses type `str`, which is not FFI-safe
+//~^^ WARN `extern` fn uses type `Struct`, which is not FFI-safe
+    Struct(bind)
+}
+
+fn main() {}

tests/ui/extern/extern-C-str-arg-ice-80125.stderr

@@ -0,0 +1,35 @@
+warning: `extern` fn uses type `str`, which is not FFI-safe
+  --> $DIR/extern-C-str-arg-ice-80125.rs:3:23
+   |
+LL | type ExternCallback = extern "C" fn(*const u8, u32, str);
+   |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
+   |
+   = help: consider using `*const u8` and a length instead
+   = note: string slices have no C equivalent
+   = note: `#[warn(improper_ctypes_definitions)]` on by default
+
+warning: `extern` fn uses type `str`, which is not FFI-safe
+  --> $DIR/extern-C-str-arg-ice-80125.rs:9:44
+   |
+LL | pub extern "C" fn register_something(bind: ExternCallback) -> Struct {
+   |                                            ^^^^^^^^^^^^^^ not FFI-safe
+   |
+   = help: consider using `*const u8` and a length instead
+   = note: string slices have no C equivalent
+
+warning: `extern` fn uses type `Struct`, which is not FFI-safe
+  --> $DIR/extern-C-str-arg-ice-80125.rs:9:63
+   |
+LL | pub extern "C" fn register_something(bind: ExternCallback) -> Struct {
+   |                                                               ^^^^^^ not FFI-safe
+   |
+   = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
+   = note: this struct has unspecified layout
+note: the type is defined here
+  --> $DIR/extern-C-str-arg-ice-80125.rs:6:1
+   |
+LL | pub struct Struct(ExternCallback);
+   | ^^^^^^^^^^^^^^^^^
+
+warning: 3 warnings emitted
+

tests/ui/privacy/decl-macro-infinite-global-import-cycle-ice-64784.rs

@@ -0,0 +1,16 @@
+// ICE #64784  already borrowed: BorrowMutError
+//@ check-pass
+// issue: rust-lang/rust#64784
+#![feature(decl_macro)]
+
+pub macro m($i:ident, $j:ident) {
+    mod $i {
+        pub use crate::$j::*;
+        pub struct A;
+    }
+}
+
+m!(x, y);
+m!(y, x);
+
+fn main() {}

tests/ui/sized/stack-overflow-trait-infer-98842.32bit.stderr

@@ -0,0 +1,25 @@
+error[E0391]: cycle detected when computing layout of `Foo`
+   |
+   = note: ...which requires computing layout of `<&'static Foo as core::ops::deref::Deref>::Target`...
+   = note: ...which again requires computing layout of `Foo`, completing the cycle
+note: cycle used when const-evaluating + checking `_`
+  --> $DIR/stack-overflow-trait-infer-98842.rs:15:1
+   |
+LL | const _: *const Foo = 0 as _;
+   | ^^^^^^^^^^^^^^^^^^^
+   = note: see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information
+
+error[E0080]: it is undefined behavior to use this value
+  --> $DIR/stack-overflow-trait-infer-98842.rs:15:1
+   |
+LL | const _: *const Foo = 0 as _;
+   | ^^^^^^^^^^^^^^^^^^^ a cycle occurred during layout computation
+   |
+   = note: the raw bytes of the constant (size: 4, align: 4) {
+               00 00 00 00                                     │ ....
+           }
+
+error: aborting due to 2 previous errors
+
+Some errors have detailed explanations: E0080, E0391.
+For more information about an error, try `rustc --explain E0080`.

tests/ui/sized/stack-overflow-trait-infer-98842.64bit.stderr

@@ -0,0 +1,25 @@
+error[E0391]: cycle detected when computing layout of `Foo`
+   |
+   = note: ...which requires computing layout of `<&'static Foo as core::ops::deref::Deref>::Target`...
+   = note: ...which again requires computing layout of `Foo`, completing the cycle
+note: cycle used when const-evaluating + checking `_`
+  --> $DIR/stack-overflow-trait-infer-98842.rs:15:1
+   |
+LL | const _: *const Foo = 0 as _;
+   | ^^^^^^^^^^^^^^^^^^^
+   = note: see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information
+
+error[E0080]: it is undefined behavior to use this value
+  --> $DIR/stack-overflow-trait-infer-98842.rs:15:1
+   |
+LL | const _: *const Foo = 0 as _;
+   | ^^^^^^^^^^^^^^^^^^^ a cycle occurred during layout computation
+   |
+   = note: the raw bytes of the constant (size: 8, align: 8) {
+               00 00 00 00 00 00 00 00                         │ ........
+           }
+
+error: aborting due to 2 previous errors
+
+Some errors have detailed explanations: E0080, E0391.
+For more information about an error, try `rustc --explain E0080`.

tests/ui/sized/stack-overflow-trait-infer-98842.rs

@@ -0,0 +1,18 @@
+// #98842 stack overflow in trait inference
+// issue: rust-lang/rust#98842
+//@ check-fail
+//@ edition:2021
+//@ stderr-per-bitwidth
+//@ ignore-endian-big
+//~^^^^^^ ERROR cycle detected when computing layout of `Foo`
+
+// If the inner `Foo` is named through an associated type,
+// the "infinite size" error does not occur.
+struct Foo(<&'static Foo as ::core::ops::Deref>::Target);
+// But Rust will be unable to know whether `Foo` is sized or not,
+// and it will infinitely recurse somewhere trying to figure out the
+// size of this pointer (is my guess):
+const _: *const Foo = 0 as _;
+//~^ ERROR it is undefined behavior to use this value
+
+pub fn main() {}

tests/ui/sized/stack-overflow-trait-infer-98842.stderr

@@ -0,0 +1,25 @@
+error[E0391]: cycle detected when computing layout of `Foo`
+   |
+   = note: ...which requires computing layout of `<&'static Foo as core::ops::deref::Deref>::Target`...
+   = note: ...which again requires computing layout of `Foo`, completing the cycle
+note: cycle used when const-evaluating + checking `_`
+  --> $DIR/stack-overflow-trait-infer-98842.rs:13:1
+   |
+LL | const _: *const Foo = 0 as _;
+   | ^^^^^^^^^^^^^^^^^^^
+   = note: see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information
+
+error[E0080]: it is undefined behavior to use this value
+  --> $DIR/stack-overflow-trait-infer-98842.rs:13:1
+   |
+LL | const _: *const Foo = 0 as _;
+   | ^^^^^^^^^^^^^^^^^^^ a cycle occurred during layout computation
+   |
+   = note: the raw bytes of the constant (size: 8, align: 8) {
+               00 00 00 00 00 00 00 00                         │ ........
+           }
+
+error: aborting due to 2 previous errors
+
+Some errors have detailed explanations: E0080, E0391.
+For more information about an error, try `rustc --explain E0080`.

tests/ui/unsized-locals/ice-size_and_align_of-closure-not-supported-88212.rs

@@ -0,0 +1,21 @@
+// ICE size_and_align_of::<[[email protected]:15:5: 17:7]> not supported #88212
+// issue: rust-lang/rust#88212
+#![feature(unsized_locals)]
+//~^ WARN the feature `unsized_locals` is incomplete and may not be safe to use and/or cause compiler crashes
+
+trait Example {}
+struct Foo();
+
+impl Example for Foo {}
+
+fn example() -> Box<dyn Example> {
+    Box::new(Foo())
+}
+
+fn main() {
+    let x: dyn Example = *example();
+    (move || {
+        let _y = x;
+        //~^ ERROR the size for values of type `dyn Example` cannot be known at compilation time
+    })();
+}

tests/ui/unsized-locals/ice-size_and_align_of-closure-not-supported-88212.stderr

@@ -0,0 +1,23 @@
+warning: the feature `unsized_locals` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/ice-size_and_align_of-closure-not-supported-88212.rs:3:12
+   |
+LL | #![feature(unsized_locals)]
+   |            ^^^^^^^^^^^^^^
+   |
+   = note: see issue #48055 <https://github.com/rust-lang/rust/issues/48055> for more information
+   = note: `#[warn(incomplete_features)]` on by default
+
+error[E0277]: the size for values of type `dyn Example` cannot be known at compilation time
+  --> $DIR/ice-size_and_align_of-closure-not-supported-88212.rs:18:18
+   |
+LL |     (move || {
+   |           -- this closure captures all values by move
+LL |         let _y = x;
+   |                  ^ doesn't have a size known at compile-time
+   |
+   = help: the trait `Sized` is not implemented for `dyn Example`
+   = note: all values captured by value by a closure must have a statically known size
+
+error: aborting due to 1 previous error; 1 warning emitted
+
+For more information about this error, try `rustc --explain E0277`.