{"ast_node_type":"other","tokens":[{"end":71,"kind":"keyword","start":0,"text":"//"}]}
            // if this is moved to `rustc_codegen_ssa::mir::debuginfo`.
            // FIXME(eddyb) this would be `self.monomorphize(&callee)`
            let callee = cx.tcx.instantiate_and_normalize_erasing_regions(