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https://github.com/rust-lang/rust
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27 lines
541 B
Rust
27 lines
541 B
Rust
// check-pass
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// edition:2018
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// compile-flags: -Z span-debug
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// aux-build:test-macros.rs
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// Tests that we properly pass tokens to proc-macro when nested
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// nonterminals are involved.
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#![no_std] // Don't load unnecessary hygiene information from std
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extern crate std;
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#[macro_use]
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extern crate test_macros;
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macro_rules! wrap {
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(first, $e:expr) => { wrap!(second, $e + 1) };
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(second, $e:expr) => { wrap!(third, $e + 2) };
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(third, $e:expr) => {
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print_bang!($e + 3)
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};
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}
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fn main() {
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let _ = wrap!(first, 0);
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}
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