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c19d56c902
Additional tests to ensure let is rejected during parsing In the original stabilization PR, @ `compiler-errors` has [pointed out](https://github.com/rust-lang/rust/pull/94927#issuecomment-1165156328) that #97295 wasn't enough to address the concerns about having `let` in expressions being rejected at parsing time, instead of later. Thankfully, since then the situation has been greatly improved by #115677. This PR adds some additional tests to `disallowed-positions.rs`, and adds two additional revisions to the "normal" case which is now given the `feature` name: * `no_feature`: Added to incorporate `disallowed-positions-without-feature-gate.rs` into the file, reducing duplication. * `nothing`: like feature, but all functions are cfg'd out. Ensures that the errors are really emitted during parsing. cc tracking issue #53667