syntax_data: {"ast_node_type":"variable","tokens":[{"end":153,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                         let non_1zst_elem = arg_layout.non_1zst_field(cx).expect("not exactly one non-1-ZST field in non-ZST repr(transparent) union").1;
context_before:                     if arg_layout.is_transparent() {
context_after:                         return should_use_fp_conv_helper(