Problems reported:

parser/coverage/string2:2:22: Expected ';' after this.
  return """æbler$bar"""
                     ^^^

parser/coverage/string2:6:10: Expected ';' after this.
  return """æbler"""
         ^^^^^^^^^^^

parser/coverage/string2:10:10: Expected ';' after this.
  return r"""hello"""
         ^^^^^^^^^^^^

parser/coverage/string2:14:10: Expected ';' after this.
  return """
         ^^^^...

parser/coverage/string2:21:10: Expected ';' after this.
  return """æbler\
         ^^^^^^^^^

parser/coverage/string2:21:10: String starting with """ must end with """.
  return """æbler\
         ^^^^^^^^^

parser/coverage/string2:19:13: Can't find '}' to match '{'.
void quux() {
            ^

beginCompilationUnit(void)
  beginMetadataStar(void)
  endMetadataStar(0)
  beginTopLevelMember(void)
    beginTopLevelMethod(UnmatchedToken({), null, null)
      handleVoidKeyword(void)
      handleIdentifier(foo, topLevelFunctionDeclaration)
      handleNoTypeVariables(()
      beginFormalParameters((, MemberKind.TopLevelMethod)
        beginMetadataStar(dynamic)
        endMetadataStar(0)
        beginFormalParameter(dynamic, MemberKind.TopLevelMethod, null, null, null)
          handleIdentifier(dynamic, typeReference)
          handleNoTypeArguments(bar)
          handleType(dynamic, null)
          handleIdentifier(bar, formalParameterDeclaration)
          handleFormalParameterWithoutValue())
        endFormalParameter(null, null, null, bar, null, null, FormalParameterKind.requiredPositional, MemberKind.TopLevelMethod)
      endFormalParameters(1, (, ), MemberKind.TopLevelMethod)
      handleAsyncModifier(null, null)
      beginBlockFunctionBody({)
        beginReturnStatement(return)
          beginLiteralString("""æbler)
            handleIdentifier(bar, expression)
            handleNoTypeArguments(""")
            handleNoArguments(""")
            handleSend(bar, bar)
            handleInterpolationExpression($, null)
            handleStringPart(""")
          endLiteralString(1, })
          handleRecoverableError(Message[Template(ExpectedAfterButGot), Expected ';' after this., null, {string: ;}], """, """)
        endReturnStatement(true, return, ;)
      endBlockFunctionBody(1, {, })
    endTopLevelMethod(void, null, })
  endTopLevelDeclaration(})
  beginMetadataStar(void)
  endMetadataStar(0)
  beginTopLevelMember(void)
    beginTopLevelMethod(}, null, null)
      handleVoidKeyword(void)
      handleIdentifier(bar, topLevelFunctionDeclaration)
      handleNoTypeVariables(()
      beginFormalParameters((, MemberKind.TopLevelMethod)
      endFormalParameters(0, (, ), MemberKind.TopLevelMethod)
      handleAsyncModifier(null, null)
      beginBlockFunctionBody({)
        beginReturnStatement(return)
          beginLiteralString("""æbler""")
          endLiteralString(0, })
          handleRecoverableError(Message[Template(ExpectedAfterButGot), Expected ';' after this., null, {string: ;}], """æbler""", """æbler""")
        endReturnStatement(true, return, ;)
      endBlockFunctionBody(1, {, })
    endTopLevelMethod(void, null, })
  endTopLevelDeclaration(})
  beginMetadataStar(void)
  endMetadataStar(0)
  beginTopLevelMember(void)
    beginTopLevelMethod(}, null, null)
      handleVoidKeyword(void)
      handleIdentifier(baz, topLevelFunctionDeclaration)
      handleNoTypeVariables(()
      beginFormalParameters((, MemberKind.TopLevelMethod)
      endFormalParameters(0, (, ), MemberKind.TopLevelMethod)
      handleAsyncModifier(null, null)
      beginBlockFunctionBody({)
        beginReturnStatement(return)
          beginLiteralString(r"""hello""")
          endLiteralString(0, })
          handleRecoverableError(Message[Template(ExpectedAfterButGot), Expected ';' after this., null, {string: ;}], r"""hello""", r"""hello""")
        endReturnStatement(true, return, ;)
      endBlockFunctionBody(1, {, })
    endTopLevelMethod(void, null, })
  endTopLevelDeclaration(})
  beginMetadataStar(void)
  endMetadataStar(0)
  beginTopLevelMember(void)
    beginTopLevelMethod(}, null, null)
      handleVoidKeyword(void)
      handleIdentifier(qux, topLevelFunctionDeclaration)
      handleNoTypeVariables(()
      beginFormalParameters((, MemberKind.TopLevelMethod)
      endFormalParameters(0, (, ), MemberKind.TopLevelMethod)
      handleAsyncModifier(null, null)
      beginBlockFunctionBody({)
        beginReturnStatement(return)
          beginLiteralString("""
æbler
""")
          endLiteralString(0, })
          handleRecoverableError(Message[Template(ExpectedAfterButGot), Expected ';' after this., null, {string: ;}], """
æbler
""", """
æbler
""")
        endReturnStatement(true, return, ;)
      endBlockFunctionBody(1, {, })
    endTopLevelMethod(void, null, })
  endTopLevelDeclaration(})
  beginMetadataStar(void)
  endMetadataStar(0)
  beginTopLevelMember(void)
    beginTopLevelMethod(}, null, null)
      handleVoidKeyword(void)
      handleIdentifier(quux, topLevelFunctionDeclaration)
      handleNoTypeVariables(()
      beginFormalParameters((, MemberKind.TopLevelMethod)
      endFormalParameters(0, (, ), MemberKind.TopLevelMethod)
      handleAsyncModifier(null, null)
      beginBlockFunctionBody({)
        beginReturnStatement(return)
          beginLiteralString("""æbler\""")
          endLiteralString(0, })
          handleRecoverableError(Message[Template(ExpectedAfterButGot), Expected ';' after this., null, {string: ;}], """æbler\""", """æbler\""")
        endReturnStatement(true, return, ;)
      endBlockFunctionBody(1, {, })
    endTopLevelMethod(void, null, })
  endTopLevelDeclaration(})
  handleErrorToken(UnterminatedString("""))
  handleRecoverableError(Message[Template(UnterminatedString), String starting with """ must end with """., null, {string: """, string2: """}], UnterminatedString("""), UnterminatedString("""))
  handleErrorToken(UnmatchedToken({))
  handleRecoverableError(Message[Template(UnmatchedToken), Can't find '}' to match '{'., null, {string: }, lexeme: {}], UnmatchedToken({), UnmatchedToken({))
endCompilationUnit(5, )