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Add some comments about why never!() never happens

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hkalbasi 2022-04-22 19:22:18 +04:30
parent d33d5fca1d
commit 0b5dd42fac
1 changed files with 6 additions and 1 deletions
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7
crates/hir_ty/src/lower.rs
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@ -749,7 +749,8 @@ impl<'a> TyLoweringContext<'a> {
had_explicit_args = true; had_explicit_args = true;
substs.push(x); substs.push(x);
} else { } else {
never!(); // we just filtered them out
never!("Unexpected lifetime argument");
} }
} }
} }
@ -1673,6 +1674,10 @@ pub(crate) fn lower_to_chalk_mutability(m: hir_def::type_ref::Mutability) -> Mut
} }
} }
/// Checks if the provided generic arg matches its expected kind, then lower them via
/// provided closures. Use unknown if there was kind mismatch.
///
/// Returns `Some` of the lowered generic arg. `None` if the provided arg is a lifetime.
pub(crate) fn generic_arg_to_chalk<'a, T>( pub(crate) fn generic_arg_to_chalk<'a, T>(
db: &dyn HirDatabase, db: &dyn HirDatabase,
kind_id: Either<TypeParamId, ConstParamId>, kind_id: Either<TypeParamId, ConstParamId>,