mirror of https://github.com/rust-lang/rust
34 lines
740 B
Rust
34 lines
740 B
Rust
// Regression test for the ICE described in #87046.
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#![crate_type="lib"]
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#![allow(unreachable_patterns)]
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#[derive(PartialEq, Eq)]
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#[repr(transparent)]
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pub struct Username(str);
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pub const ROOT_USER: &Username = Username::from_str("root");
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impl Username {
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pub const fn from_str(raw: &str) -> &Self {
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union Transmute<'a> {
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raw: &'a str,
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typed: &'a Username,
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}
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unsafe { Transmute { raw }.typed }
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}
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pub const fn as_str(&self) -> &str {
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&self.0
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}
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pub fn is_root(&self) -> bool {
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match self {
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ROOT_USER => true,
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//~^ ERROR: cannot use unsized non-slice type `Username` in constant patterns
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_ => false,
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}
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}
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}
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