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rust/tests/ui/issues/issue-43250.rs

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ast_validation: forbid "nonstandard" literal patterns Since #42886, macros can create "nonstandard" PatKind::Lit patterns, that contain path expressions instead of the usual literal expr. These can cause trouble, including ICEs. We *could* map these nonstandard patterns to PatKind::Path patterns during HIR lowering, but that would be much effort for little gain, and I think is too risky for beta. So let's just forbid them during AST validation. Fixes #43250.
2017-08-13 16:59:54 +03:00
fn main() {
let mut y;
const C: u32 = 0;
macro_rules! m {
($a:expr) => {
let $a = 0;
}
}
m!(y);
//~^ ERROR arbitrary expressions aren't allowed in patterns
m!(C);
//~^ ERROR arbitrary expressions aren't allowed in patterns
}
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