Esteban Küber c439a59dbd Change the desugaring of assert! for better error output ...

In the desugaring of `assert!`, we now expand to a `match` expression
instead of `if !cond {..}`.

The span of incorrect conditions will point only at the expression, and not
the whole `assert!` invocation.

```
error[E0308]: mismatched types
  --> $DIR/issue-14091.rs:2:13
   |
LL |     assert!(1,1);
   |             ^ expected `bool`, found integer
```

We no longer mention the expression needing to implement the `Not` trait.

```
error[E0308]: mismatched types
  --> $DIR/issue-14091-2.rs:15:13
   |
LL |     assert!(x, x);
   |             ^ expected `bool`, found `BytePos`
```

`assert!(val)` now desugars to:

```rust
match val {
    true => {},
    _ => $crate::panic::panic_2021!(),
}
```

Fix #122159.

We make some minor changes to some diagnostics to avoid span overlap on
type mismatch or inverted "expected"/"found" on type errors.

We remove some unnecessary parens from core, alloc and miri.

address review comments

2025-08-12 16:30:48 +00:00

..

break-inside-inline-const-issue-128604.rs

Add regression test for break inside const items

2025-06-10 08:34:27 +00:00

break-inside-inline-const-issue-128604.stderr

Loop check anon consts on their own

2025-06-10 08:41:23 +00:00

const-expr-array-init.rs

…

const-expr-basic.rs

…

const-expr-generic-err2.rs

…

const-expr-generic-err2.stderr

…

const-expr-generic-err.rs

…

const-expr-generic-err.stderr

Change the desugaring of assert! for better error output

2025-08-12 16:30:48 +00:00

const-expr-generic.rs

…

const-expr-inference.rs

…

const-expr-lifetime-err.rs

…

const-expr-lifetime-err.stderr

…

const-expr-lifetime.rs

…

const-expr-macro.rs

…

const-expr-reference.rs

…

cross-const-control-flow-125846.rs

…

cross-const-control-flow-125846.stderr

Remove check_mod_loops query and run the checks per-body instead

2025-06-10 08:41:23 +00:00

elided-lifetime-being-infer-vars.rs

…

expr-unsafe-err.rs

…

expr-unsafe-err.stderr

…

expr-unsafe.rs

…

expr-unsafe.stderr

…

expr-with-block-err.rs

…

expr-with-block-err.stderr

…

expr-with-block.rs

…

in-pat-recovery.rs

const-block-as-pattern: do not refer to no-longer-existing nightly feature

2025-07-07 16:18:41 +02:00

in-pat-recovery.stderr

const-block-as-pattern: do not refer to no-longer-existing nightly feature

2025-07-07 16:18:41 +02:00

instance-doesnt-depend-on-type.rs

…

interpolated.rs

…

macro-with-const.rs

…

promotion.rs

…

promotion.stderr

…

referencing-local-variables.rs

…

referencing-local-variables.stderr

…

required-const.rs

…

required-const.stderr

…

uninit-local.rs

…

uninit-local.stderr

…

using-late-bound-from-closure.rs

…

using-late-bound-from-closure.stderr

…