mirror of https://github.com/rust-lang/rust
35 lines
916 B
Rust
35 lines
916 B
Rust
#![feature(if_let_guard)]
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enum Enum<'a> {
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A(&'a isize),
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B(bool),
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}
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fn if_guard() -> isize {
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let mut n = 42;
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let mut x = Enum::A(&mut n);
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match x {
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Enum::A(_) if { x = Enum::B(false); false } => 1,
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//~^ ERROR cannot assign `x` in match guard
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Enum::A(_) if { let y = &mut x; *y = Enum::B(false); false } => 1,
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//~^ ERROR cannot mutably borrow `x` in match guard
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Enum::A(p) => *p,
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Enum::B(_) => 2,
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}
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}
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fn if_let_guard() -> isize {
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let mut n = 42;
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let mut x = Enum::A(&mut n);
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match x {
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Enum::A(_) if let Some(()) = { x = Enum::B(false); None } => 1,
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//~^ ERROR cannot assign `x` in match guard
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Enum::A(_) if let Some(()) = { let y = &mut x; *y = Enum::B(false); None } => 1,
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//~^ ERROR cannot mutably borrow `x` in match guard
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Enum::A(p) => *p,
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Enum::B(_) => 2,
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}
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}
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fn main() {}
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