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There was an incomplete version of the check in parsing and a second version in AST validation. This meant that some, but not all, invalid uses were allowed inside macros/disabled cfgs. It also means that later passes have a hard time knowing when the let expression is in a valid location, sometimes causing ICEs. - Add a field to ExprKind::Let in AST/HIR to mark whether it's in a valid location. - Suppress later errors and MIR construction for invalid let expressions.
15 lines
192 B
Rust
15 lines
192 B
Rust
// Regression test for #104172
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const N: usize = {
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struct U;
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!let y = 42;
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//~^ ERROR expected expression, found `let` statement
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3
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};
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struct S {
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x: [(); N]
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}
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fn main() {}
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