Function match_ty_with_ident 

pub fn match_ty_with_ident<'tcx>(
    tcx: TyCtxt<'tcx>,
    def_id: DefId,
    type_ident: String,
) -> Option<Ty<'tcx>>

Match a type-identifier string to a concrete Ty.

Checks in order:

1. Primitive types (u32, bool, …)
2. Generic type parameters in the function signature or self type