syntax_data: {"ast_node_type":"variable","tokens":[{"end":56,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                     let field = arg_layout.field(cx, i);
context_before:                 for i in arg_layout.fields.index_by_increasing_offset() {
context_after:                     should_use_fp_conv_helper(cx, &field, xlen, flen, field1_kind, field2_kind)?;