Port PR 62923: Fix crash in abstract property checking for unnamed class expressions

internal/checker/checker.go

@@ -11452,10 +11452,10 @@ func (c *Checker) checkPropertyAccessibilityAtLocation(location *ast.Node, isSup
 	if flags&ast.ModifierFlagsAbstract != 0 && c.symbolHasNonMethodDeclaration(prop) && (isThisProperty(location) ||
 		isThisInitializedObjectBindingExpression(location) ||
 		ast.IsObjectBindingPattern(location.Parent) && isThisInitializedDeclaration(location.Parent.Parent)) {
-		declaringClassDeclaration := ast.GetClassLikeDeclarationOfSymbol(c.getParentOfSymbol(prop))
-		if declaringClassDeclaration != nil && c.isNodeUsedDuringClassInitialization(location) {
+		parentSymbol := c.getParentOfSymbol(prop)
+		if parentSymbol != nil && parentSymbol.Flags&ast.SymbolFlagsClass != 0 && c.isNodeUsedDuringClassInitialization(location) {
 			if errorNode != nil {
-				c.error(errorNode, diagnostics.Abstract_property_0_in_class_1_cannot_be_accessed_in_the_constructor, c.symbolToString(prop), declaringClassDeclaration.Name().Text())
+				c.error(errorNode, diagnostics.Abstract_property_0_in_class_1_cannot_be_accessed_in_the_constructor, c.symbolToString(prop), c.symbolToString(parentSymbol))
 			}
 			return false
 		}

testdata/baselines/reference/compiler/errorInUnnamedClassExpression.errors.txt

@@ -0,0 +1,21 @@
+errorInUnnamedClassExpression.ts(5,14): error TS2715: Abstract property 'bar' in class 'Foo' cannot be accessed in the constructor.
+errorInUnnamedClassExpression.ts(7,5): error TS1253: Abstract properties can only appear within an abstract class.
+errorInUnnamedClassExpression.ts(7,14): error TS7008: Member 'bar' implicitly has an 'any' type.
+
+
+==== errorInUnnamedClassExpression.ts (3 errors) ====
+    // https://github.com/microsoft/TypeScript/issues/62920
+
+    let Foo = class {
+        constructor() {
+            this.bar++;
+                 ~~~
+!!! error TS2715: Abstract property 'bar' in class 'Foo' cannot be accessed in the constructor.
+        }
+        abstract bar;
+        ~~~~~~~~
+!!! error TS1253: Abstract properties can only appear within an abstract class.
+                 ~~~
+!!! error TS7008: Member 'bar' implicitly has an 'any' type.
+    };
+

testdata/baselines/reference/compiler/errorInUnnamedClassExpression.symbols

@@ -0,0 +1,19 @@
+//// [tests/cases/compiler/errorInUnnamedClassExpression.ts] ////
+
+=== errorInUnnamedClassExpression.ts ===
+// https://github.com/microsoft/TypeScript/issues/62920
+
+let Foo = class {
+>Foo : Symbol(Foo, Decl(errorInUnnamedClassExpression.ts, 2, 3))
+
+    constructor() {
+        this.bar++;
+>this.bar : Symbol(Foo.bar, Decl(errorInUnnamedClassExpression.ts, 5, 5))
+>this : Symbol(Foo, Decl(errorInUnnamedClassExpression.ts, 2, 9))
+>bar : Symbol(Foo.bar, Decl(errorInUnnamedClassExpression.ts, 5, 5))
+    }
+    abstract bar;
+>bar : Symbol(Foo.bar, Decl(errorInUnnamedClassExpression.ts, 5, 5))
+
+};
+

testdata/baselines/reference/compiler/errorInUnnamedClassExpression.types

@@ -0,0 +1,21 @@
+//// [tests/cases/compiler/errorInUnnamedClassExpression.ts] ////
+
+=== errorInUnnamedClassExpression.ts ===
+// https://github.com/microsoft/TypeScript/issues/62920
+
+let Foo = class {
+>Foo : typeof Foo
+>class {    constructor() {        this.bar++;    }    abstract bar;} : typeof Foo
+
+    constructor() {
+        this.bar++;
+>this.bar++ : number
+>this.bar : any
+>this : this
+>bar : any
+    }
+    abstract bar;
+>bar : any
+
+};
+

testdata/tests/cases/compiler/errorInUnnamedClassExpression.ts

@@ -0,0 +1,11 @@
+// @strict: true
+// @noEmit: true
+
+// https://github.com/microsoft/TypeScript/issues/62920
+
+let Foo = class {
+    constructor() {
+        this.bar++;
+    }
+    abstract bar;
+};