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|
// Here we test all the places `|` is *syntactically* allowed.
// This is not a semantic test. We only test parsing.
// check-pass
fn main() {}
// Test the `pat` macro fragment parser:
macro_rules! accept_pat {
($p:pat) => {};
}
accept_pat!((p | q));
accept_pat!((p | q,));
accept_pat!(TS(p | q));
accept_pat!(NS { f: p | q });
accept_pat!([p | q]);
// Non-macro tests:
#[cfg(FALSE)]
fn or_patterns() {
// Top level of `let`:
let (A | B);
let (A | B);
let (A | B): u8;
let (A | B) = 0;
let (A | B): u8 = 0;
// Top level of `for`:
for A | B in 0 {}
for A | B in 0 {}
// Top level of `while`:
while let A | B = 0 {}
while let A | B = 0 {}
// Top level of `if`:
if let A | B = 0 {}
if let A | B = 0 {}
// Top level of `match` arms:
match 0 {
A | B => {}
A | B => {}
}
// Functions:
fn fun((A | B): _) {}
// Lambdas:
let _ = |(A | B): u8| ();
// Parenthesis and tuple patterns:
let (A | B);
let (A | B,);
// Tuple struct patterns:
let A(B | C);
let E::V(B | C);
// Struct patterns:
let S { f1: B | C, f2 };
let E::V { f1: B | C, f2 };
// Slice patterns:
let [A | B, .. | ..];
// These bind as `(prefix p) | q` as opposed to `prefix (p | q)`:
let (box 0 | 1); // Unstable; we *can* change the precedence if we want.
//~^ WARN box pattern syntax is experimental
//~| WARN unstable syntax
let (&0 | 1);
let (&mut 0 | 1);
let (x @ 0 | 1);
let (ref x @ 0 | 1);
let (ref mut x @ 0 | 1);
}
|
