Problems reported:

parser/error_recovery/issue_45327_prime_1.crash:3:19: Expected ';' after this.
    if (key is! T or
                  ^^

parser/error_recovery/issue_45327_prime_1.crash:3:8: Can't find ')' to match '('.
    if (key is! T or
       ^

beginCompilationUnit(class)
  beginMetadataStar(class)
  endMetadataStar(0)
  beginClassOrMixinOrNamedMixinApplicationPrelude(class)
    handleIdentifier(Foo, classOrMixinDeclaration)
    beginTypeVariables(<)
      beginMetadataStar(T)
      endMetadataStar(0)
      handleIdentifier(T, typeVariableDeclaration)
      beginTypeVariable(T)
        handleTypeVariablesDefined(T, 1)
        handleNoType(T)
      endTypeVariable(>, 0, null, null)
    endTypeVariables(<, >)
    beginClassDeclaration(class, null, Foo)
      handleNoType(>)
      handleClassExtends(null, 1)
      handleClassNoWithClause()
      handleClassOrMixinImplements(null, 0)
      handleClassHeader(class, class, null)
      beginClassOrMixinOrExtensionBody(DeclarationKind.Class, {)
        beginMetadataStar(foo)
        endMetadataStar(0)
        beginMember()
          beginMethod(DeclarationKind.Class, null, null, null, null, null, foo)
            handleNoType({)
            handleIdentifier(foo, methodDeclaration)
            handleNoTypeVariables(()
            beginFormalParameters((, MemberKind.NonStaticMethod)
              beginMetadataStar(Object)
              endMetadataStar(0)
              beginFormalParameter(Object, MemberKind.NonStaticMethod, null, null, null)
                handleIdentifier(Object, typeReference)
                handleNoTypeArguments(?)
                handleType(Object, ?)
                handleIdentifier(key, formalParameterDeclaration)
                handleFormalParameterWithoutValue())
              endFormalParameter(null, null, null, key, null, null, FormalParameterKind.mandatory, MemberKind.NonStaticMethod)
            endFormalParameters(1, (, ), MemberKind.NonStaticMethod)
            handleNoInitializers()
            handleAsyncModifier(null, null)
            beginBlockFunctionBody({)
              beginIfStatement(if)
                handleIdentifier(key, expression)
                handleNoTypeArguments(is)
                handleNoArguments(is)
                handleSend(key, is)
                beginIsOperatorType(is)
                  handleIdentifier(T, typeReference)
                  handleNoTypeArguments(or)
                  handleType(T, null)
                endIsOperatorType(is)
                handleIsOperator(is, !)
                handleParenthesizedCondition(()
                beginThenStatement(or)
                  handleIdentifier(or, expression)
                  handleNoTypeArguments(})
                  handleNoArguments(})
                  handleSend(or, })
                  handleRecoverableError(Message[ExpectedAfterButGot, Expected ';' after this., null, {string: ;}], or, or)
                  handleExpressionStatement(;)
                endThenStatement(;)
              endIfStatement(if, null)
            endBlockFunctionBody(1, {, })
          endClassMethod(null, foo, (, null, })
        endMember()
      endClassOrMixinOrExtensionBody(DeclarationKind.Class, 1, {, })
    endClassDeclaration(class, })
  endTopLevelDeclaration()
  handleErrorToken(UnmatchedToken(())
  handleRecoverableError(Message[UnmatchedToken, Can't find ')' to match '('., null, {string: ), lexeme: (}], UnmatchedToken((), UnmatchedToken(())
endCompilationUnit(1, )