Panic due to result::unwrap() called on an Err value: TypeError(DiagnosticVoucher(PhantomData<()>)) at crates/analyzer/src/namespace/items.rs:1918:64

[bshastry]

use std::context::{Emittable}

struct Custom {}

impl Emittable for Custom {
  fn emit(self, _val: A) {}
}

panics here

fe/crates/analyzer/src/namespace/items.rs

Line 1918 in c1036e9

let impl_param_ty = impl_param.typ.clone().unwrap();

Repro

fe build test.fe

[bshastry]

This test also panics on driver2 here

fe/crates/hir-analysis/src/ty/def_analysis.rs

Line 596 in 4643ced

let trait_inst = lower_trait_ref(db, trait_ref, impl_trait.scope()).unwrap();

[Y-Nak]

Thank you for reporting the error. Regarding v2, this error has been fixed in #942