Emit compile-time errors for conflicting modifiers.

tests/co19/co19-dart2js.status

 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 [ $compiler == dart2js && $runtime == drt ]
 LibTest/core/List/sort_A01_t02: Pass, Fail # v8 bug: Issue 12293
 LibTest/core/List/sort_A01_t03: Pass, Fail # v8 bug: Issue 12293
 LibTest/core/Map/Map_class_A01_t04: Pass, Fail # v8 bug: Issue 12293
 
 [ $compiler == dart2js && $runtime == jsshell ]
@@ skipping 292 matching lines @@
 
 
 [ $compiler == dart2js && ($runtime == ie10 || $runtime == ff || $runtime == chrome || $runtime == drt || $runtime == safari || $runtime == opera) ]
 *: Skip
 
 #
 # Missing compile-time errors.
 #
 [ $compiler == dart2js ]
 Language/03_Overview/1_Scoping_A01_t39: Fail # dartbug.com/7202
-Language/05_Variables/05_Variables_A01_t04: Fail # Checks that a variable declaration cannot contain both 'final' and 'var'.
-Language/05_Variables/05_Variables_A01_t05: Fail # Checks that a variable declaration cannot contain both 'var' and 'type'.
-Language/05_Variables/05_Variables_A01_t08: Fail # Checks different variables in a single variable declaration must be delimited by commas.
-Language/05_Variables/05_Variables_A01_t12: Fail # Checks that variable declaration cannot contain both 'const' and 'var'.
-Language/05_Variables/05_Variables_A01_t13: Fail # Checks that variable declaration cannot contain both 'const' and 'final'.
-Language/05_Variables/05_Variables_A01_t14: Fail # Checks that variable declaration cannot contain 'const', 'final' and 'var' simultaneously.
 Language/05_Variables/05_Variables_A07_t07: Fail # Checks that a compile-time error occurs if a global constant variable is not initialized at declaration.
 Language/05_Variables/05_Variables_A07_t08: Fail # Checks that a compile-time error occurs if a global typed constant variable is not initialized at declaration.
 Language/05_Variables/05_Variables_A08_t01: Fail # Checks that a compile-time error occurs if a constant variable is not initialized.
 Language/06_Functions/2_Formal_Parameters/1_Required_Formals_A02_t04: Fail # Checks that static variable declaration can't be a required formal parameter
 Language/06_Functions/2_Formal_Parameters/1_Required_Formals_A02_t06: Fail # Checks that a functionSignature parameter cannot be final.
 Language/06_Functions/2_Formal_Parameters/1_Required_Formals_A02_t07: Fail # Checks that a functionSignature parameter cannot be declared as variable.
 Language/06_Functions/2_Formal_Parameters/2_Optional_Formals_A03_t03: Fail # TODO(ahe): Enforce optional parameter semantics.
 Language/06_Functions/2_Formal_Parameters/2_Optional_Formals_A03_t04: Fail # TODO(ahe): Enforce optional parameter semantics.
 Language/07_Classes/07_Classes_A02_t11: Fail # Checks that it is a compile-time error if a static final variable declaration does not include explicit initializer.
 Language/12_Expressions/01_Constants_A20_t03: Fail # Checks that an identifier expression that denotes a type parameter  can not be assigned to a constant variable.
@@ skipping 313 matching lines @@
 
 [ $compiler == dart2js ]
 Language/07_Classes/6_Constructors/3_Constant_Constructors_A05_t04: fail # co19-roll r587: Please triage this failure
 Language/07_Classes/6_Constructors/3_Constant_Constructors_A05_t04: fail # co19-roll r587: Please triage this failure
 LibTest/json/stringify_A01_t01: fail # co19-roll r587: Please triage this failure
 LibTest/json/stringify_A02_t01: fail # co19-roll r587: Please triage this failure
 LibTest/math/pow_A04_t01: fail # co19-roll r587: Please triage this failure
 LibTest/math/pow_A14_t01: fail # co19-roll r587: Please triage this failure
 LibTest/math/pow_A16_t01: fail # co19-roll r587: Please triage this failure