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Auto merge of #82447 - Amanieu:legacy_const_generics, r=oli-obk

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Add #[rustc_legacy_const_generics]

This is the first step towards removing `#[rustc_args_required_const]`: a new attribute is added which rewrites function calls of the form `func(a, b, c)` to `func::<{b}>(a, c)`. This allows previously stabilized functions in `stdarch` which use `rustc_args_required_const` to use const generics instead.

This new attribute is not intended to ever be stabilized, it is only intended for use in `stdarch` as a replacement for `#[rustc_args_required_const]`.

```rust
#[rustc_legacy_const_generics(1)]
pub fn foo<const Y: usize>(x: usize, z: usize) -> [usize; 3] {
    [x, Y, z]
}

fn main() {
    assert_eq!(foo(0 + 0, 1 + 1, 2 + 2), [0, 2, 4]);
    assert_eq!(foo::<{1 + 1}>(0 + 0, 2 + 2), [0, 2, 4]);
}
```

r? `@oli-obk`
This commit is contained in:
bors 2021-02-25 18:14:50 +00:00
commit 98f8cce6db
16 changed files with 429 additions and 4 deletions
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1
compiler/rustc_span/src/symbol.rs
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@ -981,6 +981,7 @@ symbols! {
rustc_layout,
rustc_layout_scalar_valid_range_end,
rustc_layout_scalar_valid_range_start,
rustc_legacy_const_generics,
rustc_macro_transparency,
rustc_mir,
rustc_nonnull_optimization_guaranteed,