Can not get the span of `Mutability` from ast

[whizsid]

Currently we can not get the span of mut keyword.

Example:-

fn foo(file:`& /* Some comment */ mut /* Another Comment */ File`) {}

I like to work on this issue. But I need an advice. If I store the span in an enum field like Mutability::Mut(Span) I can not implement the invert function.

rust/compiler/rustc_ast/src/ast.rs

Line 752 in 7bade6e

pub fn invert(self) -> Self {

.

[jyn514]

@whizsid for questions about compiler internals, I recommend asking on the Zulip instead: https://rust-lang.zulipchat.com/#narrow/stream/182449-t-compiler.2Fhelp. This isn't really a bug in rustc, and the issue tracker isn't checked as frequently as the Zulip.