Test duplicate identifier reporting in classes

tests/baselines/reference/classWithDuplicateIdentifier.errors.txt

@@ -0,0 +1,31 @@
+tests/cases/compiler/classWithDuplicateIdentifier.ts(3,5): error TS2300: Duplicate identifier 'a'.
+tests/cases/compiler/classWithDuplicateIdentifier.ts(6,5): error TS2300: Duplicate identifier 'b'.
+tests/cases/compiler/classWithDuplicateIdentifier.ts(7,5): error TS2300: Duplicate identifier 'b'.
+tests/cases/compiler/classWithDuplicateIdentifier.ts(11,5): error TS2300: Duplicate identifier 'c'.
+tests/cases/compiler/classWithDuplicateIdentifier.ts(11,5): error TS2403: Subsequent variable declarations must have the same type.  Variable 'c' must be of type 'number', but here has type 'string'.
+
+
+==== tests/cases/compiler/classWithDuplicateIdentifier.ts (5 errors) ====
+    class C {
+        a(): number { return 0; } // error: duplicate identifier
+        a: number;
+        ~
+!!! error TS2300: Duplicate identifier 'a'.
+    }
+    class K {
+        b: number; // error: duplicate identifier
+        ~
+!!! error TS2300: Duplicate identifier 'b'.
+        b(): number { return 0; }
+        ~
+!!! error TS2300: Duplicate identifier 'b'.
+    }
+    class D {
+        c: number;
+        c: string;
+        ~
+!!! error TS2300: Duplicate identifier 'c'.
+        ~
+!!! error TS2403: Subsequent variable declarations must have the same type.  Variable 'c' must be of type 'number', but here has type 'string'.
+    }
+    

tests/baselines/reference/classWithDuplicateIdentifier.js

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+//// [classWithDuplicateIdentifier.ts]
+class C {
+    a(): number { return 0; } // error: duplicate identifier
+    a: number;
+}
+class K {
+    b: number; // error: duplicate identifier
+    b(): number { return 0; }
+}
+class D {
+    c: number;
+    c: string;
+}
+
+
+//// [classWithDuplicateIdentifier.js]
+var C = (function () {
+    function C() {
+    }
+    C.prototype.a = function () { return 0; }; // error: duplicate identifier
+    return C;
+}());
+var K = (function () {
+    function K() {
+    }
+    K.prototype.b = function () { return 0; };
+    return K;
+}());
+var D = (function () {
+    function D() {
+    }
+    return D;
+}());

tests/cases/compiler/classWithDuplicateIdentifier.ts

@@ -0,0 +1,12 @@
+class C {
+    a(): number { return 0; } // error: duplicate identifier
+    a: number;
+}
+class K {
+    b: number; // error: duplicate identifier
+    b(): number { return 0; }
+}
+class D {
+    c: number;
+    c: string;
+}