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25 lines
650 B
Rust
25 lines
650 B
Rust
//! This test verifies that the `?` operator expansion is hygienic,
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//! i.e., it's not affected by other `val` and `err` bindings that may be in scope.
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//!
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//! Note: Prior to the Try trait stabilization, `expr?` expanded to a match
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//! with `val` and `err` bindings. The current implementation uses Try::branch()
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//! but this test remains relevant for hygiene verification.
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//@ run-pass
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#![allow(non_upper_case_globals)]
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#![allow(dead_code)]
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use std::num::ParseIntError;
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fn main() {
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assert_eq!(parse(), Ok(1));
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}
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fn parse() -> Result<i32, ParseIntError> {
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const val: char = 'a';
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const err: char = 'b';
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Ok("1".parse::<i32>()?)
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}
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