Rollup merge of #72934 - christianpoveda:mut-borrows-in-consts, r=oli-obk
forbid mutable references in all constant contexts except for const-fns PR to address #71212 cc: @ecstatic-morse
This commit is contained in:
Manish Goregaokar
GitHub
commit
dac512e04a
32 changed files with 193 additions and 141 deletions
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@ -2,10 +2,10 @@ static X: i32 = 1;
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const C: i32 = 2;
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static mut M: i32 = 3;
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const CR: &'static mut i32 = &mut C; //~ ERROR E0658
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static STATIC_REF: &'static mut i32 = &mut X; //~ ERROR E0658
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const CR: &'static mut i32 = &mut C; //~ ERROR E0764
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static STATIC_REF: &'static mut i32 = &mut X; //~ ERROR E0764
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//~| ERROR E0019
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//~| ERROR cannot borrow
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static CONST_REF: &'static mut i32 = &mut C; //~ ERROR E0658
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static STATIC_MUT_REF: &'static mut i32 = unsafe { &mut M }; //~ ERROR E0658
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static CONST_REF: &'static mut i32 = &mut C; //~ ERROR E0764
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static STATIC_MUT_REF: &'static mut i32 = unsafe { &mut M }; //~ ERROR E0764
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fn main() {}
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@ -1,11 +1,8 @@
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error[E0658]: references in constants may only refer to immutable values
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error[E0764]: mutable references are not allowed in constants
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--> $DIR/E0017.rs:5:30
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LL | const CR: &'static mut i32 = &mut C;
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| ^^^^^^ constants require immutable values
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= note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
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= help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
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| ^^^^^^ `&mut` is only allowed in `const fn`
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error[E0019]: static contains unimplemented expression type
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--> $DIR/E0017.rs:6:39
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@ -15,14 +12,11 @@ LL | static STATIC_REF: &'static mut i32 = &mut X;
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= help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
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error[E0658]: references in statics may only refer to immutable values
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error[E0764]: mutable references are not allowed in statics
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--> $DIR/E0017.rs:6:39
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LL | static STATIC_REF: &'static mut i32 = &mut X;
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| ^^^^^^ statics require immutable values
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= note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
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= help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
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| ^^^^^^ `&mut` is only allowed in `const fn`
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error[E0596]: cannot borrow immutable static item `X` as mutable
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--> $DIR/E0017.rs:6:39
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@ -30,25 +24,19 @@ error[E0596]: cannot borrow immutable static item `X` as mutable
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LL | static STATIC_REF: &'static mut i32 = &mut X;
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| ^^^^^^ cannot borrow as mutable
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error[E0658]: references in statics may only refer to immutable values
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error[E0764]: mutable references are not allowed in statics
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--> $DIR/E0017.rs:9:38
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LL | static CONST_REF: &'static mut i32 = &mut C;
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| ^^^^^^ statics require immutable values
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= note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
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= help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
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| ^^^^^^ `&mut` is only allowed in `const fn`
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error[E0658]: references in statics may only refer to immutable values
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error[E0764]: mutable references are not allowed in statics
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--> $DIR/E0017.rs:10:52
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LL | static STATIC_MUT_REF: &'static mut i32 = unsafe { &mut M };
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| ^^^^^^ statics require immutable values
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= note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
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= help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
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| ^^^^^^ `&mut` is only allowed in `const fn`
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error: aborting due to 6 previous errors
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Some errors have detailed explanations: E0019, E0596, E0658.
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Some errors have detailed explanations: E0019, E0596, E0764.
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For more information about an error, try `rustc --explain E0019`.
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@ -1,10 +1,10 @@
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static X: i32 = 1;
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const C: i32 = 2;
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const CR: &'static mut i32 = &mut C; //~ ERROR E0658
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static STATIC_REF: &'static mut i32 = &mut X; //~ ERROR E0658
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const CR: &'static mut i32 = &mut C; //~ ERROR E0764
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static STATIC_REF: &'static mut i32 = &mut X; //~ ERROR E0019
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//~| ERROR cannot borrow
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//~| ERROR E0019
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static CONST_REF: &'static mut i32 = &mut C; //~ ERROR E0658
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//~| ERROR E0764
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static CONST_REF: &'static mut i32 = &mut C; //~ ERROR E0764
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fn main() {}
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@ -1,11 +1,8 @@
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error[E0658]: references in constants may only refer to immutable values
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error[E0764]: mutable references are not allowed in constants
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--> $DIR/E0388.rs:4:30
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LL | const CR: &'static mut i32 = &mut C;
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| ^^^^^^ constants require immutable values
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= note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
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= help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
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| ^^^^^^ `&mut` is only allowed in `const fn`
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error[E0019]: static contains unimplemented expression type
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--> $DIR/E0388.rs:5:39
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@ -15,14 +12,11 @@ LL | static STATIC_REF: &'static mut i32 = &mut X;
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= help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
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error[E0658]: references in statics may only refer to immutable values
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error[E0764]: mutable references are not allowed in statics
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--> $DIR/E0388.rs:5:39
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LL | static STATIC_REF: &'static mut i32 = &mut X;
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| ^^^^^^ statics require immutable values
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= note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
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= help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
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| ^^^^^^ `&mut` is only allowed in `const fn`
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error[E0596]: cannot borrow immutable static item `X` as mutable
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--> $DIR/E0388.rs:5:39
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@ -30,16 +24,13 @@ error[E0596]: cannot borrow immutable static item `X` as mutable
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LL | static STATIC_REF: &'static mut i32 = &mut X;
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| ^^^^^^ cannot borrow as mutable
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error[E0658]: references in statics may only refer to immutable values
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error[E0764]: mutable references are not allowed in statics
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--> $DIR/E0388.rs:8:38
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LL | static CONST_REF: &'static mut i32 = &mut C;
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| ^^^^^^ statics require immutable values
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= note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
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= help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
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| ^^^^^^ `&mut` is only allowed in `const fn`
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error: aborting due to 5 previous errors
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Some errors have detailed explanations: E0019, E0596, E0658.
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Some errors have detailed explanations: E0019, E0596, E0764.
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For more information about an error, try `rustc --explain E0019`.
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