quote 0.6.13

Quasi-quoting macro quote!(...)
Documentation 
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#[test]
fn test_integer128() {
    let ii128 = -1i128;
    let uu128 = 1u128;

    let tokens = quote! {
        #ii128 #uu128
    };
    let expected = "-1i128 1u128";
    assert_eq!(expected, tokens.to_string());
}