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e1a87ca17a
This is a bit unfortunate, but code needs to be able to fatally error early on (in particular, syntax_pos after we move SourceMap there). It's also a tiny bit of code, which means it's ultimately not that bad.
31 lines
880 B
Rust
31 lines
880 B
Rust
/// Used as a return value to signify a fatal error occurred. (It is also
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/// used as the argument to panic at the moment, but that will eventually
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/// not be true.)
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#[derive(Copy, Clone, Debug)]
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#[must_use]
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pub struct FatalError;
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pub struct FatalErrorMarker;
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// Don't implement Send on FatalError. This makes it impossible to panic!(FatalError).
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// We don't want to invoke the panic handler and print a backtrace for fatal errors.
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impl !Send for FatalError {}
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impl FatalError {
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pub fn raise(self) -> ! {
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std::panic::resume_unwind(Box::new(FatalErrorMarker))
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}
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}
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impl std::fmt::Display for FatalError {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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write!(f, "parser fatal error")
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}
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}
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impl std::error::Error for FatalError {
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fn description(&self) -> &str {
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"The parser has encountered a fatal error"
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}
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}
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