{"ast_node_type":"variable","tokens":[{"end":47,"kind":"keyword","start":0,"text":"let"}]}
    let a = f32x4::from([0.1, -1.9, 4.5, 5.5]);
    // llvm intrinsic: llvm.roundeven.v4f32
    let e = f32x4::from([0., -2., 4., 6.]);