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fixed an erroneous assertion

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Arthur Ozga
2015-06-30 15:19:51 -07:00
parent 5864a66fbc
commit 994b73f9cb
1 changed files with 4 additions and 2 deletions
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6
src/compiler/checker.ts
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@@ -11703,10 +11703,12 @@ namespace ts {
// derived class inherits base without override/redeclaration
let derivedClassDecl = getDeclarationOfKind(type.symbol, SyntaxKind.ClassDeclaration);
Debug.assert(derivedClassDecl !== undefined);
// Debug.assert(derivedClassDecl !== undefined);
// It is an error to inherit an abstract member without implementing it or being declared abstract.
if ((baseDeclarationFlags & NodeFlags.Abstract) && !(derivedClassDecl.flags & NodeFlags.Abstract)) {
// If there is no declaration for the derived class (as in the case of class expressions),
// then the class cannot be declared abstract.
if ( baseDeclarationFlags & NodeFlags.Abstract && (!derivedClassDecl || !(derivedClassDecl.flags & NodeFlags.Abstract))) {
error(derivedClassDecl, Diagnostics.Non_abstract_class_0_does_not_implement_inherited_abstract_member_1_from_class_2,
typeToString(type), symbolToString(baseProperty), typeToString(baseType));
}