Address PR: report error on super call instead of entire constructor node

Author: Kanchalai Tanglertsampan

src/compiler/checker.ts

@@ -11886,10 +11886,10 @@ namespace ts {
             const containingClassDecl = <ClassDeclaration>node.parent;
             if (getClassExtendsHeritageClauseElement(containingClassDecl)) {
                 const classExtendsNull = classDeclarationExtendsNull(containingClassDecl);
-
-                if (getSuperCallInConstructor(node)) {
+                const superCall = getSuperCallInConstructor(node);
+                if (superCall) {
                     if (classExtendsNull) {
-                        error(node, Diagnostics.A_constructor_cannot_contain_a_super_call_when_its_class_extends_null);
+                        error(superCall, Diagnostics.A_constructor_cannot_contain_a_super_call_when_its_class_extends_null);
                     }
 
                     // The first statement in the body of a constructor (excluding prologue directives) must be a super call

tests/baselines/reference/classExtendsNull.errors.txt

@@ -1,17 +1,14 @@
-tests/cases/compiler/classExtendsNull.ts(2,5): error TS17005: A constructor cannot contain a 'super' call when its class extends 'null'
+tests/cases/compiler/classExtendsNull.ts(3,9): error TS17005: A constructor cannot contain a 'super' call when its class extends 'null'
 
 
 ==== tests/cases/compiler/classExtendsNull.ts (1 errors) ====
     class C extends null {
         constructor() {
-        ~~~~~~~~~~~~~~~
             super();
-    ~~~~~~~~~~~~~~~~
+            ~~~~~~~
+!!! error TS17005: A constructor cannot contain a 'super' call when its class extends 'null'
             return Object.create(null);
-    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
         }
-    ~~~~~
-!!! error TS17005: A constructor cannot contain a 'super' call when its class extends 'null'
     }
 
     class D extends null {

tests/baselines/reference/superCallBeforeThisAccessing4.errors.txt

@@ -1,30 +1,24 @@
-tests/cases/conformance/es6/classDeclaration/superCallBeforeThisAccessing4.ts(3,5): error TS17005: A constructor cannot contain a 'super' call when its class extends 'null'
-tests/cases/conformance/es6/classDeclaration/superCallBeforeThisAccessing4.ts(11,5): error TS17005: A constructor cannot contain a 'super' call when its class extends 'null'
+tests/cases/conformance/es6/classDeclaration/superCallBeforeThisAccessing4.ts(5,9): error TS17005: A constructor cannot contain a 'super' call when its class extends 'null'
+tests/cases/conformance/es6/classDeclaration/superCallBeforeThisAccessing4.ts(12,9): error TS17005: A constructor cannot contain a 'super' call when its class extends 'null'
 
 
 ==== tests/cases/conformance/es6/classDeclaration/superCallBeforeThisAccessing4.ts (2 errors) ====
     class D extends null {
         private _t;
         constructor() {
-        ~~~~~~~~~~~~~~~
             this._t;
-    ~~~~~~~~~~~~~~~~
             super();
-    ~~~~~~~~~~~~~~~~
-        }
-    ~~~~~
+            ~~~~~~~
 !!! error TS17005: A constructor cannot contain a 'super' call when its class extends 'null'
+        }
     }
 
     class E extends null {
         private _t;
         constructor() {
-        ~~~~~~~~~~~~~~~
             super();
-    ~~~~~~~~~~~~~~~~
+            ~~~~~~~
+!!! error TS17005: A constructor cannot contain a 'super' call when its class extends 'null'
             this._t;
-    ~~~~~~~~~~~~~~~~
         }
-    ~~~~~
-!!! error TS17005: A constructor cannot contain a 'super' call when its class extends 'null'
     }