66 lines
901 B
Rust
66 lines
901 B
Rust
//@ run-pass
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macro_rules! mypat {
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() => (
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Some('y')
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)
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}
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macro_rules! char_x {
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() => (
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'x'
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)
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}
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macro_rules! some {
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($x:pat) => (
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Some($x)
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)
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}
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macro_rules! indirect {
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() => (
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some!(char_x!())
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)
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}
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macro_rules! ident_pat {
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($x:ident) => (
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$x
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)
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}
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fn f(c: Option<char>) -> usize {
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match c {
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Some('x') => 1,
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mypat!() => 2,
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_ => 3,
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}
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}
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pub fn main() {
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assert_eq!(1, f(Some('x')));
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assert_eq!(2, f(Some('y')));
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assert_eq!(3, f(None));
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assert_eq!(1, match Some('x') {
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Some(char_x!()) => 1,
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_ => 2,
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});
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assert_eq!(1, match Some('x') {
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some!(char_x!()) => 1,
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_ => 2,
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});
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assert_eq!(1, match Some('x') {
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indirect!() => 1,
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_ => 2,
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});
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assert_eq!(3, {
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let ident_pat!(x) = 2;
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x+1
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});
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}
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