{"ast_node_type":"variable","tokens":[{"end":76,"kind":"keyword","start":0,"text":"let"}]}
    let field1 = builder.context.new_field(None, builder.u8_type, "field1");
    let m128i = builder.context.new_vector_type(builder.i64_type, 2);
    let field2 = builder.context.new_field(None, m128i, "field2");