69c78a98ee
Disallow shadowing const parameters This pull request fixes #85348. Trying to shadow a `const` parameter as follows: ```rust fn foo<const N: i32>() { let N @ _ = 0; } ``` currently causes an ICE. With my changes, I get: ``` error[E0530]: let bindings cannot shadow const parameters --> test.rs:2:9 | 1 | fn foo<const N: i32>() { | - the const parameter `N` is defined here 2 | let N @ _ = 0; | ^ cannot be named the same as a const parameter error: aborting due to previous error ``` This is the same error you get when trying to shadow a constant: ```rust const N: i32 = 0; let N @ _ = 0; ``` ``` error[E0530]: let bindings cannot shadow constants --> src/lib.rs:3:5 | 2 | const N: i32 = 0; | ----------------- the constant `N` is defined here 3 | let N @ _ = 0; | ^ cannot be named the same as a constant error: aborting due to previous error ``` The reason for disallowing shadowing in both cases is described [here](https://github.com/rust-lang/rust/issues/33118#issuecomment-233962221) (the comment there only talks about constants, but the same reasoning applies to `const` parameters). |
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