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MIR validation attempts to determine the number of bytes needed to represent the size of the source type to compute the discriminant for the inhabited target enum. For a ZST source, there is no source data to use as a discriminant so no proper runtime check can be generated. Since that should never be possible, insert a delayed bug to ensure the problem has been properly reported to the user by the type checker.
15 lines
330 B
Rust
15 lines
330 B
Rust
// Do not attempt to take the discriminant as the source
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// converted to a `u128`, that won't work for ZST.
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//
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//@ compile-flags: -Zvalidate-mir
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enum A {
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B,
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C,
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}
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fn main() {
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let _: A = unsafe { std::mem::transmute(()) };
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//~^ ERROR cannot transmute between types of different sizes, or dependently-sized types
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}
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