Matthias Krüger
48cf90f337
Error on attempt to construct scalable vector type
If you attempt to construct a scalable vector type rust will ICE.
E.g.:
```rust
#[rustc_scalable_vector(4)]
#[allow(non_camel_case_types)]
struct svint32_t(i32);
fn main() {
let foo = svint32_t(1);
// This will ICE
}
```
This PR adds a check that will emit an error if you attempt to use a SV constructor and a test to ensure it works.
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