Problems reported:

parser/general/function_reference_following_token:79:29: A comparison expression can't be an operand of another comparison expression.
var operators_lessThan = f<a><b>;
                            ^

parser/general/function_reference_following_token:79:33: Expected '[' before this.
var operators_lessThan = f<a><b>;
                                ^

parser/general/function_reference_following_token:89:46: A comparison expression can't be an operand of another comparison expression.
var operators_openBracket_error = f(a<b,c>[d]>e);
                                             ^

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  beginTopLevelMember(var)
    beginFields(;)
      handleNoType(var)
      handleIdentifier(operators_bang_paren, topLevelVariableDeclaration)
      beginFieldInitializer(=)
        handleIdentifier(f, expression)
        handleNoTypeArguments(()
        beginArguments(()
          handleIdentifier(a, expression)
          handleNoTypeArguments(<)
          handleNoArguments(<)
          handleSend(a, <)
          beginBinaryExpression(<)
            handleIdentifier(b, expression)
            handleNoTypeArguments(,)
            handleNoArguments(,)
            handleSend(b, ,)
          endBinaryExpression(<)
          handleIdentifier(c, expression)
          handleNoTypeArguments(>)
          handleNoArguments(>)
          handleSend(c, >)
          beginBinaryExpression(>)
            handleIdentifier(d, expression)
            handleNoTypeArguments())
            handleNoArguments())
            handleSend(d, ))
            handleParenthesizedExpression(()
            handleUnaryPrefixExpression(!)
          endBinaryExpression(>)
        endArguments(2, (, ))
        handleSend(f, ;)
      endFieldInitializer(=, ;)
    endTopLevelFields(null, null, null, null, var, 1, var, ;)
  endTopLevelDeclaration(var)
  beginMetadataStar(var)
  endMetadataStar(0)
  beginTopLevelMember(var)
    beginFields(;)
      handleNoType(var)
      handleIdentifier(operators_lessThan, topLevelVariableDeclaration)
      beginFieldInitializer(=)
        handleIdentifier(f, expression)
        handleNoTypeArguments(<)
        handleNoArguments(<)
        handleSend(f, <)
        beginBinaryExpression(<)
          handleIdentifier(a, expression)
          handleNoTypeArguments(>)
          handleNoArguments(>)
          handleSend(a, >)
        endBinaryExpression(<)
        handleRecoverableError(EqualityCannotBeEqualityOperand, >, >)
        beginBinaryExpression(>)
          beginTypeArguments(<)
            handleIdentifier(b, typeReference)
            handleNoTypeArguments(>)
            handleType(b, null)
          endTypeArguments(1, <, >)
          handleRecoverableError(Message[ExpectedButGot, Expected '[' before this., null, {string: [}], ;, ;)
          handleLiteralList(0, [, null, ])
        endBinaryExpression(>)
      endFieldInitializer(=, ;)
    endTopLevelFields(null, null, null, null, var, 1, var, ;)
  endTopLevelDeclaration(var)
  beginMetadataStar(var)
  endMetadataStar(0)
  beginTopLevelMember(var)
    beginFields(;)
      handleNoType(var)
      handleIdentifier(operators_minus, topLevelVariableDeclaration)
      beginFieldInitializer(=)
        handleIdentifier(f, expression)
        handleNoTypeArguments(()
        beginArguments(()
          handleIdentifier(a, expression)
          handleNoTypeArguments(<)
          handleNoArguments(<)
          handleSend(a, <)
          beginBinaryExpression(<)
            handleIdentifier(b, expression)
            handleNoTypeArguments(,)
            handleNoArguments(,)
            handleSend(b, ,)
          endBinaryExpression(<)
          handleIdentifier(c, expression)
          handleNoTypeArguments(>)
          handleNoArguments(>)
          handleSend(c, >)
          beginBinaryExpression(>)
            handleIdentifier(d, expression)
            handleNoTypeArguments())
            handleNoArguments())
            handleSend(d, ))
            handleUnaryPrefixExpression(-)
          endBinaryExpression(>)
        endArguments(2, (, ))
        handleSend(f, ;)
      endFieldInitializer(=, ;)
    endTopLevelFields(null, null, null, null, var, 1, var, ;)
  endTopLevelDeclaration(var)
  beginMetadataStar(var)
  endMetadataStar(0)
  beginTopLevelMember(var)
    beginFields(;)
      handleNoType(var)
      handleIdentifier(operators_openBracket, topLevelVariableDeclaration)
      beginFieldInitializer(=)
        handleIdentifier(f, expression)
        handleNoTypeArguments(()
        beginArguments(()
          handleIdentifier(a, expression)
          handleNoTypeArguments(<)
          handleNoArguments(<)
          handleSend(a, <)
          beginBinaryExpression(<)
            handleIdentifier(b, expression)
            handleNoTypeArguments(,)
            handleNoArguments(,)
            handleSend(b, ,)
          endBinaryExpression(<)
          handleIdentifier(c, expression)
          handleNoTypeArguments(>)
          handleNoArguments(>)
          handleSend(c, >)
          beginBinaryExpression(>)
            handleNoTypeArguments([)
            handleIdentifier(d, expression)
            handleNoTypeArguments(])
            handleNoArguments(])
            handleSend(d, ])
            handleLiteralList(1, [, null, ])
          endBinaryExpression(>)
        endArguments(2, (, ))
        handleSend(f, ;)
      endFieldInitializer(=, ;)
    endTopLevelFields(null, null, null, null, var, 1, var, ;)
  endTopLevelDeclaration(var)
  beginMetadataStar(var)
  endMetadataStar(0)
  beginTopLevelMember(var)
    beginFields(;)
      handleNoType(var)
      handleIdentifier(operators_openBracket_error, topLevelVariableDeclaration)
      beginFieldInitializer(=)
        handleIdentifier(f, expression)
        handleNoTypeArguments(()
        beginArguments(()
          handleIdentifier(a, expression)
          handleNoTypeArguments(<)
          handleNoArguments(<)
          handleSend(a, <)
          beginBinaryExpression(<)
            handleIdentifier(b, expression)
            handleNoTypeArguments(,)
            handleNoArguments(,)
            handleSend(b, ,)
          endBinaryExpression(<)
          handleIdentifier(c, expression)
          handleNoTypeArguments(>)
          handleNoArguments(>)
          handleSend(c, >)
          beginBinaryExpression(>)
            handleNoTypeArguments([)
            handleIdentifier(d, expression)
            handleNoTypeArguments(])
            handleNoArguments(])
            handleSend(d, ])
            handleLiteralList(1, [, null, ])
          endBinaryExpression(>)
          handleRecoverableError(EqualityCannotBeEqualityOperand, >, >)
          beginBinaryExpression(>)
            handleIdentifier(e, expression)
            handleNoTypeArguments())
            handleNoArguments())
            handleSend(e, ))
          endBinaryExpression(>)
        endArguments(2, (, ))
        handleSend(f, ;)
      endFieldInitializer(=, ;)
    endTopLevelFields(null, null, null, null, var, 1, var, ;)
  endTopLevelDeclaration(var)
  beginMetadataStar(var)
  endMetadataStar(0)
  beginTopLevelMember(var)
    beginFields(;)
      handleNoType(var)
      handleIdentifier(operators_openBracket_unambiguous, topLevelVariableDeclaration)
      beginFieldInitializer(=)
        handleIdentifier(f, expression)
        handleNoTypeArguments(()
        beginArguments(()
          handleIdentifier(a, expression)
          handleNoTypeArguments(<)
          handleNoArguments(<)
          handleSend(a, <)
          beginBinaryExpression(<)
            handleIdentifier(b, expression)
            handleNoTypeArguments(,)
            handleNoArguments(,)
            handleSend(b, ,)
          endBinaryExpression(<)
          handleIdentifier(c, expression)
          handleNoTypeArguments(>)
          handleNoArguments(>)
          handleSend(c, >)
          beginBinaryExpression(>)
            handleNoTypeArguments([)
            handleIdentifier(d, expression)
            handleNoTypeArguments(,)
            handleNoArguments(,)
            handleSend(d, ,)
            handleIdentifier(e, expression)
            handleNoTypeArguments(])
            handleNoArguments(])
            handleSend(e, ])
            handleLiteralList(2, [, null, ])
          endBinaryExpression(>)
        endArguments(2, (, ))
        handleSend(f, ;)
      endFieldInitializer(=, ;)
    endTopLevelFields(null, null, null, null, var, 1, var, ;)
  endTopLevelDeclaration()
endCompilationUnit(34, )