Issue caputuring a single char quoted by quotation marks

[Bear Battle]

Hello,

I am trying to parse a char sequence where all quted by quitaion marks:

["a", "b", "c"]
// Or
['a', 'b', 'c']

I am using this struct to do the job:

type Char struct {
	Val *byte `("\""|"'")@Char("\""|"'")`
}

However, when I am parse example, I got 1:1: unexpected token "'a'".

Here is the testcase:

func TestParseSingleChar(t *testing.T) {
	parser := participle.MustBuild[Char]()
	tests := []struct {
		name  string
		input string
		want  byte
	}{
		{
			"BackWithDoubleQuota",
			`"a"`,
			'0',
		},
		{
			"BackWithNoQuote",
			`a`,
			'0',
		},
		{
			"BackWithSingleQuota",
			`'a'`,
			'0',
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			result, err := parser.ParseString("", tt.input)
			assert.NoError(t, err)
		})
	}
}
}

Result:

        	Error:      	Received unexpected error:
        	            	1:1: unexpected token "\"a\""
        	Test:       	TestChar_getValue/BackWithDoubleQuota

How do I get the job done with correct definition for Char structure ?