Function rustc_typeck::collect::compute_sig_of_foreign_fn_decl

fn compute_sig_of_foreign_fn_decl<'tcx>(
    tcx: TyCtxt<'tcx>, 
    def_id: DefId, 
    decl: &'tcx FnDecl<'tcx>, 
    abi: Abi, 
    ident: Ident
) -> PolyFnSig<'tcx>