Fixes #2575. Remove null-aware warnings for CFE

Language/Classes/Instance_Methods/Operators/allowed_names_t05.dart

@@ -20,6 +20,4 @@ main() {
   c!;
 // ^
 // [analyzer] STATIC_WARNING.UNNECESSARY_NON_NULL_ASSERTION
-//^
-// [cfe] Operand of null-aware operation '!' has type 'C' which excludes null.
 }

Language/Expressions/Assignable_Expressions/getter_invocation_t02.dart

@@ -29,13 +29,9 @@ main() {
   Expect.equals(1, a?.x);
 //                  ^^
 // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
-//                 ^
-// [cfe] Operand of null-aware operation '?.' has type 'A' which excludes null.
   Expect.equals(20, a?.y);
 //                   ^^
 // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
-//                  ^
-// [cfe] Operand of null-aware operation '?.' has type 'A' which excludes null.
   Expect.isNull(b?.x);
   Expect.isNull(b?.y);
 }

Language/Expressions/Assignment/Compound_Assignment/null_aware_compound_assignment_static_t01.dart

@@ -4,6 +4,7 @@
 
 /// @assertion A compound assignment of the form C?.v op= e2 is equivalent to
 /// the expression C.v op= e2.
+///
 /// @description Checks that an expression of the of the form C?.v *= e2 is
 /// equivalent to the expression C.v *= e2.
 /// @author sgrekhov@unipro.ru
@@ -41,17 +42,13 @@ main() {
   Expect.throws(() {C?.v *= 2;});
 //                   ^^
 // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
-//                  ^
-// [cfe] The class 'C' cannot be null.
   Expect.equals(1, C.getterInvocation);
   Expect.equals(0, C.setterInvocation);
 
   C.init(2);
   var res3 = (C?.v *= 2);
 //             ^^
 // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
-//            ^
-// [cfe] The class 'C' cannot be null.
   Expect.equals(1, C.getterInvocation);
   Expect.equals(1, C.setterInvocation);
   Expect.equals(4, res3);

Language/Expressions/Assignment/Compound_Assignment/null_aware_compound_assignment_static_t02.dart

@@ -4,6 +4,7 @@
 
 /// @assertion A compound assignment of the form C?.v op= e2 is equivalent to
 /// the expression C.v op= e2.
+///
 /// @description Checks that an expression of the of the form C?.v /= e2 is
 /// equivalent to the expression C.v /= e2.
 /// @author sgrekhov@unipro.ru
@@ -41,17 +42,13 @@ main() {
   Expect.throws(() {C?.v /= 2;});
 //                   ^^
 // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
-//                  ^
-// [cfe] The class 'C' cannot be null.
   Expect.equals(1, C.getterInvocation);
   Expect.equals(0, C.setterInvocation);
 
   C.init(6);
   var res3 = (C?.v /= 2);
 //             ^^
 // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
-//            ^
-// [cfe] The class 'C' cannot be null.
   Expect.equals(1, C.getterInvocation);
   Expect.equals(1, C.setterInvocation);
   Expect.equals(3, res3);

Language/Expressions/Assignment/Compound_Assignment/null_aware_compound_assignment_static_t03.dart

@@ -4,6 +4,7 @@
 
 /// @assertion A compound assignment of the form C?.v op= e2 is equivalent to
 /// the expression C.v op= e2.
+///
 /// @description Checks that an expression of the of the form C?.v ~/= e2 is
 /// equivalent to the expression C.v ~/= e2.
 /// @author sgrekhov@unipro.ru
@@ -41,17 +42,13 @@ main() {
   Expect.throws(() {C?.v ~/= 2;});
 //                   ^^
 // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
-//                  ^
-// [cfe] The class 'C' cannot be null.
   Expect.equals(1, C.getterInvocation);
   Expect.equals(0, C.setterInvocation);
 
   C.init(5);
   var res3 = (C?.v ~/= 2);
 //             ^^
 // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
-//            ^
-// [cfe] The class 'C' cannot be null.
   Expect.equals(1, C.getterInvocation);
   Expect.equals(1, C.setterInvocation);
   Expect.equals(2, res3);

Language/Expressions/Assignment/Compound_Assignment/null_aware_compound_assignment_static_t04.dart

@@ -4,6 +4,7 @@
 
 /// @assertion A compound assignment of the form C?.v op= e2 is equivalent to
 /// the expression C.v op= e2.
+///
 /// @description Checks that an expression of the of the form C?.v %= e2 is
 /// equivalent to the expression C.v %= e2.
 /// @author sgrekhov@unipro.ru
@@ -41,17 +42,13 @@ main() {
   Expect.throws(() {C?.v %= 2;});
 //                   ^^
 // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
-//                  ^
-// [cfe] The class 'C' cannot be null.
   Expect.equals(1, C.getterInvocation);
   Expect.equals(0, C.setterInvocation);
 
   C.init(5);
   var res3 = (C?.v %= 2);
 //             ^^
 // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
-//            ^
-// [cfe] The class 'C' cannot be null.
   Expect.equals(1, C.getterInvocation);
   Expect.equals(1, C.setterInvocation);
   Expect.equals(1, res3);

Language/Expressions/Assignment/Compound_Assignment/null_aware_compound_assignment_static_t05.dart

@@ -4,6 +4,7 @@
 
 /// @assertion A compound assignment of the form C?.v op= e2 is equivalent to
 /// the expression C.v op= e2.
+///
 /// @description Checks that an expression of the of the form C?.v += e2 is
 /// equivalent to the expression C.v += e2.
 /// @author sgrekhov@unipro.ru
@@ -41,17 +42,13 @@ main() {
   Expect.throws(() {C?.v += 2;});
 //                   ^^
 // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
-//                  ^
-// [cfe] The class 'C' cannot be null.
   Expect.equals(1, C.getterInvocation);
   Expect.equals(0, C.setterInvocation);
 
   C.init(5);
   var res3 = (C?.v += 2);
 //             ^^
 // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
-//            ^
-// [cfe] The class 'C' cannot be null.
   Expect.equals(1, C.getterInvocation);
   Expect.equals(1, C.setterInvocation);
   Expect.equals(7, res3);

Language/Expressions/Assignment/Compound_Assignment/null_aware_compound_assignment_static_t06.dart

@@ -4,6 +4,7 @@
 
 /// @assertion A compound assignment of the form C?.v op= e2 is equivalent to
 /// the expression C.v op= e2.
+///
 /// @description Checks that an expression of the of the form C?.v -= e2 is
 /// equivalent to the expression C.v -= e2.
 /// @author sgrekhov@unipro.ru
@@ -41,17 +42,13 @@ main() {
   Expect.throws(() {C?.v -= 2;});
 //                   ^^
 // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
-//                  ^
-// [cfe] The class 'C' cannot be null.
   Expect.equals(1, C.getterInvocation);
   Expect.equals(0, C.setterInvocation);
 
   C.init(5);
   var res3 = (C?.v -= 2);
 //             ^^
 // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
-//            ^
-// [cfe] The class 'C' cannot be null.
   Expect.equals(1, C.getterInvocation);
   Expect.equals(1, C.setterInvocation);
   Expect.equals(3, res3);

Language/Expressions/Assignment/Compound_Assignment/null_aware_compound_assignment_static_t07.dart

@@ -4,6 +4,7 @@
 
 /// @assertion A compound assignment of the form C?.v op= e2 is equivalent to
 /// the expression C.v op= e2.
+///
 /// @description Checks that an expression of the of the form C?.v <<= e2 is
 /// equivalent to the expression C.v <<= e2.
 /// @author sgrekhov@unipro.ru
@@ -41,17 +42,13 @@ main() {
   Expect.throws(() {C?.v <<= 2;});
 //                   ^^
 // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
-//                  ^
-// [cfe] The class 'C' cannot be null.
   Expect.equals(1, C.getterInvocation);
   Expect.equals(0, C.setterInvocation);
 
   C.init(5);
   var res3 = (C?.v <<= 2);
 //             ^^
 // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
-//            ^
-// [cfe] The class 'C' cannot be null.
   Expect.equals(1, C.getterInvocation);
   Expect.equals(1, C.setterInvocation);
   Expect.equals(20, res3);

Language/Expressions/Assignment/Compound_Assignment/null_aware_compound_assignment_static_t08.dart

@@ -4,6 +4,7 @@
 
 /// @assertion A compound assignment of the form C?.v op= e2 is equivalent to
 /// the expression C.v op= e2.
+///
 /// @description Checks that an expression of the of the form C?.v >>= e2 is
 /// equivalent to the expression C.v >>= e2.
 /// @author sgrekhov@unipro.ru
@@ -41,17 +42,13 @@ main() {
   Expect.throws(() {C?.v >>= 2;});
 //                   ^^
 // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
-//                  ^
-// [cfe] The class 'C' cannot be null.
   Expect.equals(1, C.getterInvocation);
   Expect.equals(0, C.setterInvocation);
 
   C.init(20);
   var res3 = (C?.v >>= 2);
 //             ^^
 // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
-//            ^
-// [cfe] The class 'C' cannot be null.
   Expect.equals(1, C.getterInvocation);
   Expect.equals(1, C.setterInvocation);
   Expect.equals(5, res3);

Language/Expressions/Assignment/Compound_Assignment/null_aware_compound_assignment_static_t09.dart

@@ -4,6 +4,7 @@
 
 /// @assertion A compound assignment of the form C?.v op= e2 is equivalent to
 /// the expression C.v op= e2.
+///
 /// @description Checks that an expression of the of the form C?.v &= e2 is
 /// equivalent to the expression C.v &= e2.
 /// @author sgrekhov@unipro.ru
@@ -41,17 +42,13 @@ main() {
   Expect.throws(() {C?.v &= 2;});
 //                   ^^
 // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
-//                  ^
-// [cfe] The class 'C' cannot be null.
   Expect.equals(1, C.getterInvocation);
   Expect.equals(0, C.setterInvocation);
 
   C.init(14);
   var res3 = (C?.v &= 7);
 //             ^^
 // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
-//            ^
-// [cfe] The class 'C' cannot be null.
   Expect.equals(1, C.getterInvocation);
   Expect.equals(1, C.setterInvocation);
   Expect.equals(6, res3);

Language/Expressions/Assignment/Compound_Assignment/null_aware_compound_assignment_static_t10.dart

@@ -4,6 +4,7 @@
 
 /// @assertion A compound assignment of the form C?.v op= e2 is equivalent to
 /// the expression C.v op= e2.
+///
 /// @description Checks that an expression of the of the form C?.v ^= e2 is
 /// equivalent to the expression C.v ^= e2.
 /// @author sgrekhov@unipro.ru
@@ -41,17 +42,13 @@ main() {
   Expect.throws(() {C?.v ^= 2;});
 //                   ^^
 // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
-//                  ^
-// [cfe] The class 'C' cannot be null.
   Expect.equals(1, C.getterInvocation);
   Expect.equals(0, C.setterInvocation);
 
   C.init(14);
   var res3 = (C?.v ^= 7);
 //             ^^
 // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
-//            ^
-// [cfe] The class 'C' cannot be null.
   Expect.equals(1, C.getterInvocation);
   Expect.equals(1, C.setterInvocation);
   Expect.equals(9, res3);

Language/Expressions/Assignment/Compound_Assignment/null_aware_compound_assignment_static_t11.dart

@@ -4,6 +4,7 @@
 
 /// @assertion A compound assignment of the form C?.v op= e2 is equivalent to
 /// the expression C.v op= e2.
+///
 /// @description Checks that an expression of the of the form C?.v |= e2 is
 /// equivalent to the expression C.v |= e2.
 /// @author sgrekhov@unipro.ru
@@ -41,17 +42,13 @@ main() {
   Expect.throws(() {C?.v |= 2;});
 //                   ^^
 // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
-//                  ^
-// [cfe] The class 'C' cannot be null.
   Expect.equals(1, C.getterInvocation);
   Expect.equals(0, C.setterInvocation);
 
   C.init(14);
   var res3 = (C?.v |= 7);
 //             ^^
 // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
-//            ^
-// [cfe] The class 'C' cannot be null.
   Expect.equals(1, C.getterInvocation);
   Expect.equals(1, C.setterInvocation);
   Expect.equals(15, res3);

Language/Expressions/Assignment/Compound_Assignment/null_aware_compound_assignment_static_t12.dart

@@ -4,6 +4,7 @@
 
 /// @assertion A compound assignment of the form C?.v op= e2 is equivalent to
 /// the expression C.v op= e2.
+///
 /// @description Checks that an expression of the of the form C?.v >>>= e2 is
 /// equivalent to the expression C.v >>>= e2.
 /// @author iarkh@unipro.ru
@@ -41,17 +42,13 @@ main() {
   Expect.throws(() {C?.v >>>= 2;});
 //                   ^^
 // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
-//                  ^
-// [cfe] The class 'C' cannot be null.
   Expect.equals(1, C.getterInvocation);
   Expect.equals(0, C.setterInvocation);
 
   C.init(20);
   var res3 = (C?.v >>>= 2);
 //             ^^
 // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
-//            ^
-// [cfe] The class 'C' cannot be null.
   var expected = 20 >>> 2;
   Expect.equals(1, C.getterInvocation);
   Expect.equals(1, C.setterInvocation);

Language/Expressions/Assignment/Compound_Assignment/null_aware_compound_assignment_t01.dart

@@ -5,11 +5,11 @@
 /// @assertion Evaluation of a compound assignment of the form e1?.v op = e2 is
 /// equivalent to ((x) => x?.v = x.v op e2)(e1) where x is a variable that is not
 /// used in e2.
+///
 /// @description Checks that an expression of the form e1?.v *= e2 is equivalent
 /// to ((x) => x?.v = x.v * e2)(e1) where x is a variable that is not used in e2.
 /// @author sgrekhov@unipro.ru
 
-
 import '../../../../Utils/expect.dart';
 
 class C {
@@ -42,15 +42,11 @@ main() {
   Expect.throws(() {c2?.v *= 2;});
 //                    ^^
 // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
-//                  ^
-// [cfe] Operand of null-aware operation '?.' has type 'C' which excludes null.
 
   C c3 = new C(3);
   var res3 = (c3?.v *= 3);
 //              ^^
 // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
-//            ^
-// [cfe] Operand of null-aware operation '?.' has type 'C' which excludes null.
   Expect.equals(1, c3.getterInvocation);
   Expect.equals(1, c3.setterInvocation);
   Expect.equals(9, res3);

Language/Expressions/Assignment/Compound_Assignment/null_aware_compound_assignment_t02.dart

@@ -5,11 +5,11 @@
 /// @assertion Evaluation of a compound assignment of the form e1?.v op = e2 is
 /// equivalent to ((x) => x?.v = x.v op e2)(e1) where x is a variable that is not
 /// used in e2.
+///
 /// @description Checks that an expression of the form e1?.v /= e2 is equivalent
 /// to ((x) => x?.v = x.v / e2)(e1) where x is a variable that is not used in e2.
 /// @author sgrekhov@unipro.ru
 
-
 import '../../../../Utils/expect.dart';
 
 class C {
@@ -42,15 +42,11 @@ main() {
   Expect.throws(() {c2?.v /= 2;});
 //                    ^^
 // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
-//                  ^
-// [cfe] Operand of null-aware operation '?.' has type 'C' which excludes null.
 
   C c3 = new C(4);
   var res3 = (c3?.v /= 2);
 //              ^^
 // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
-//            ^
-// [cfe] Operand of null-aware operation '?.' has type 'C' which excludes null.
   Expect.equals(1, c3.getterInvocation);
   Expect.equals(1, c3.setterInvocation);
   Expect.equals(2, res3);