13 lines
262 B
Rust
13 lines
262 B
Rust
#![feature(macro_metavar_expr)]
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macro_rules! metavar {
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( $i:expr ) => {
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${len(0)}
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//~^ ERROR meta-variable expression `len` with depth parameter must be called inside of a macro repetition
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};
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}
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const _: i32 = metavar!(0);
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fn main() {}
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