Make our pattern matching logic undestand &[T] constants
#70699
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r? @varkor (rust_highfive has picked a reviewer for you, use r? to override) |
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| // Deref of a reference to a ZST is a nop. | ||
| ConstValue::Scalar(Scalar::zst()) | ||
| } else { | ||
| // FIXME(oli-obk): this is reachable for `const FOO: &&&u32 = &&&42;` |
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apparently, we have a test for this, but the ICE is a different one somewhere in the middle of pattern matching. I've so far been unable to figure it out.
Co-Authored-By: varkor <[email protected]>
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| (ConstValue::Scalar(Scalar::Ptr(p)), ty::Array(t, n), ty::Slice(u)) => { | ||
| // Unsize array to slice if pattern is array | ||
| // but match value or other patterns are slice. | ||
| (ConstValue::Scalar(s), ty::Array(t, n), ty::Slice(u)) => { |
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Would be good to avoid these one-letter variable names.
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I found a rabbit hole and wrote some text about it: https://rust-lang.zulipchat.com/#narrow/stream/131828-t-compiler/topic/constants.20in.20patterns/near/192783049 I want to fix this once and for all, instead of the piecemeal thing that I've been doing the last years. |
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closing in favour of #70743 |
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We should generalize this to other types, too, so treat this as a proof of concept.