5f279d57f0
8426: Track recursion limit when expanding custom derive r=jonas-schievink a=jonas-schievink
You can write a custom derive that expands to itself:
```rust
#[proc_macro_derive(Derive)]
pub fn derive(item: TokenStream) -> TokenStream {
let mut out: TokenStream = "#[derive(Derive)]".parse().unwrap();
out.extend(item);
out
}
```
rustc reports a recursion limit error, but rust-analyzer used to spin in name resolution and eventually fail with "name resolution is stuck". This makes it fail fast by respecting the recursion depth of the invocation.
bors r+
Co-authored-by: Jonas Schievink <jonasschievink@gmail.com>
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