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36 lines
981 B
Rust
36 lines
981 B
Rust
//@ run-pass
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//@ proc-macro: test-macros.rs
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//@ compile-flags: -Z span-debug
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//@ edition:2018
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//
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// Tests the pretty-printing behavior of inserting `Invisible`-delimited groups
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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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extern crate test_macros;
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use test_macros::print_bang_consume;
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macro_rules! expand_it {
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(($val1:expr) ($val2:expr)) => { expand_it!($val1 + $val2) };
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($val:expr) => { print_bang_consume!("hi" $val (1 + 1)) };
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}
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fn main() {
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expand_it!(1 + (25) + 1);
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expand_it!(("hello".len()) ("world".len()));
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f();
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}
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// The key thing here is to produce a single `None`-delimited `Group`, even
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// though there is multiple levels of macros.
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macro_rules! m5 { ($e:expr) => { print_bang_consume!($e) }; }
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macro_rules! m4 { ($e:expr) => { m5!($e); } }
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macro_rules! m3 { ($e:expr) => { m4!($e); } }
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macro_rules! m2 { ($e:expr) => { m3!($e); } }
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macro_rules! m1 { ($e:expr) => { m2!($e); } }
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fn f() {
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m1!(123);
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}
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