mirror of https://github.com/rust-lang/rust
49 lines
1.6 KiB
Rust
49 lines
1.6 KiB
Rust
// Can't put mut in non-ident pattern
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//@ edition:2018
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#![feature(box_patterns)]
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#![allow(warnings)]
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pub fn main() {
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let mut _ = 0; //~ ERROR `mut` must be followed by a named binding
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let mut (_, _) = (0, 0); //~ ERROR `mut` must be followed by a named binding
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let mut (x @ y) = 0; //~ ERROR `mut` must be attached to each individual binding
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let mut mut x = 0;
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//~^ ERROR `mut` on a binding may not be repeated
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//~| remove the additional `mut`s
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struct Foo { x: isize }
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let mut Foo { x: x } = Foo { x: 3 };
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//~^ ERROR `mut` must be attached to each individual binding
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//~| add `mut` to each binding
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let mut Foo { x } = Foo { x: 3 };
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//~^ ERROR `mut` must be attached to each individual binding
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//~| add `mut` to each binding
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struct r#yield(u8, u8);
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let mut mut yield(become, await) = r#yield(0, 0);
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//~^ ERROR `mut` on a binding may not be repeated
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//~| ERROR `mut` must be followed by a named binding
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//~| ERROR expected identifier, found reserved keyword `yield`
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//~| ERROR expected identifier, found reserved keyword `become`
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//~| ERROR expected identifier, found keyword `await`
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struct W<T, U>(T, U);
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struct B { f: Box<u8> }
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let mut W(mut a, W(b, W(ref c, W(d, B { box f }))))
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//~^ ERROR `mut` must be attached to each individual binding
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= W(0, W(1, W(2, W(3, B { f: Box::new(4u8) }))));
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// Make sure we don't accidentally allow `mut $p` where `$p:pat`.
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macro_rules! foo {
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($p:pat) => {
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let mut $p = 0; //~ ERROR expected identifier, found `x`
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}
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}
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foo!(x);
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}
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