Lexing error of string interpolation

[blindFS]

$"(')')"

Token3 0: DqStringInterpStart span: 0 .. 2 '$"'
Token3 1: StrInterpLParen span: 2 .. 3 '('
Token3 2: Eof span: 9 .. 9 ''
Lexing error. Error: Spanned { item: Generic, span: Span { start: 3, end: 4 } }, '''

$"("foo")"

Token3 0: DqStringInterpStart span: 0 .. 2 '$"'
Token3 1: Eof span: 11 .. 11 ''
Lexing error. Error: Spanned { item: UnmatchedStrInterpLParen, span: Span { start: 2, end: 3 } }, '('