Problems reported:

parser/error_recovery/issue_45251_set_const:3:37: A set literal can't be prefixed by 'Set'.
  final Set<Undefined> foo1 = const Set<List<int>>{};
                                    ^^^

parser/error_recovery/issue_45251_set_const:9:37: A set literal can't be prefixed by 'Set'.
  final Set<Undefined> foo3 = const Set{};
                                    ^^^

parser/error_recovery/issue_45251_set_const:18:37: A set literal can't be prefixed by 'Set'.
  final Set<Undefined> foo6 = const Set<List<int>>{null};
                                    ^^^

parser/error_recovery/issue_45251_set_const:21:37: A set literal can't be prefixed by 'Set'.
  final Set<Undefined> foo7 = const Set{null};
                                    ^^^

beginCompilationUnit(class)
  beginMetadataStar(class)
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    handleIdentifier(F, classOrMixinDeclaration)
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              handleIdentifier(Undefined, typeReference)
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            handleType(Set, null)
            handleIdentifier(foo1, fieldDeclaration)
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              handleRecoverableError(Message[LiteralWithClass, A set literal can't be prefixed by 'Set'., Try removing 'Set', {string: set, lexeme: Set}], Set, Set)
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                handleLiteralSetOrMap(0, {, const, }, false)
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              handleType(Undefined, null)
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            handleType(Set, null)
            handleIdentifier(foo2, fieldDeclaration)
            beginFieldInitializer(=)
              beginConstLiteral(<)
                beginTypeArguments(<)
                  handleIdentifier(List, typeReference)
                  beginTypeArguments(<)
                    handleIdentifier(int, typeReference)
                    handleNoTypeArguments(>)
                    handleType(int, null)
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                  handleType(List, null)
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            handleType(Set, null)
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              handleRecoverableError(Message[LiteralWithClass, A set literal can't be prefixed by 'Set'., Try removing 'Set', {string: set, lexeme: Set}], Set, Set)
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              handleType(Undefined, null)
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            handleType(Set, null)
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              beginConstExpression(const)
                handleIdentifier(Set, constructorReference)
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                    handleIdentifier(List, typeReference)
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                      handleType(int, null)
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                    handleType(List, null)
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            handleType(Set, null)
            handleIdentifier(foo5, fieldDeclaration)
            beginFieldInitializer(=)
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                handleIdentifier(Set, constructorReference)
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                endConstructorReference(Set, null, ()
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              handleType(Undefined, null)
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            handleType(Set, null)
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            beginFieldInitializer(=)
              handleRecoverableError(Message[LiteralWithClass, A set literal can't be prefixed by 'Set'., Try removing 'Set', {string: set, lexeme: Set}], Set, Set)
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                beginTypeArguments(<)
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endCompilationUnit(1, )