{
    "Variant Key Mismatch": [
        ".match {$foo :x} * * {{foo}}",
        ".match {$foo :x} {$bar :x} * {{foo}}"
    ],
    "Missing Fallback Variant": [
        ".match {:foo} 1 {{_}}",
        ".match {:foo} other {{_}}",
        ".match {:foo} {:bar} * 1 {{_}} 1 * {{_}}"
    ],
    "Missing Selector Annotation": [
        ".match {$foo} one {{one}} * {{other}}",
        ".input {$foo} .match {$foo} one {{one}} * {{other}}",
        ".local $foo = {$bar} .match {$foo} one {{one}} * {{other}}"
    ],
    "Duplicate Declaration": [
        ".input {$foo} .input {$foo} {{_}}",
        ".input {$foo} .local $foo = {42} {{_}}",
        ".local $foo = {42} .input {$foo} {{_}}",
        ".local $foo = {:unknown} .local $foo = {42} {{_}}",
        ".local $foo = {$bar} .local $bar = {42} {{_}}",
        ".local $foo = {$foo} {{_}}",
        ".local $foo = {$bar} .local $bar = {$baz} {{_}}",
        ".local $foo = {$bar :func} .local $bar = {$baz} {{_}}",
        ".local $foo = {42 :func opt=$foo} {{_}}",
        ".local $foo = {42 :func opt=$bar} .local $bar = {42} {{_}}"
    ],
    "Duplicate Option Name": [
            "bad {:placeholder option=x option=x}",
            "bad {:placeholder ns:option=x ns:option=y}"
    ]
}