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10 lines
191 B
Rust
10 lines
191 B
Rust
macro_rules! join {
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($lhs:ident, $rhs:ident) => {
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let ${concat($lhs, $rhs)}: () = ();
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//~^ ERROR the `concat` meta-variable expression is unstable
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};
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}
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fn main() {
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}
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