Some test cases to verify that declaration file overwrite is reported correctly

tests/baselines/reference/declarationFileOverwriteError.errors.txt

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+error TS5055: Cannot write file 'tests/cases/compiler/a.d.ts' which is one of the input files.
+
+
+!!! error TS5055: Cannot write file 'a.d.ts' which is one of the input files.
+==== tests/cases/compiler/a.d.ts (0 errors) ====
+    
+    declare class c {
+    }
+    
+==== tests/cases/compiler/a.ts (0 errors) ====
+    class d {
+    }

tests/baselines/reference/declarationFileOverwriteError.js

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+//// [tests/cases/compiler/declarationFileOverwriteError.ts] ////
+
+//// [a.d.ts]
+
+declare class c {
+}
+
+//// [a.ts]
+class d {
+}
+
+//// [a.js]
+var d = (function () {
+    function d() {
+    }
+    return d;
+})();

tests/baselines/reference/declarationFileOverwriteErrorWithOut.errors.txt

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+error TS5055: Cannot write file 'tests/cases/compiler/out.d.ts' which is one of the input files.
+
+
+!!! error TS5055: Cannot write file 'out.d.ts' which is one of the input files.
+==== tests/cases/compiler/out.d.ts (0 errors) ====
+    
+    declare class c {
+    }
+    
+==== tests/cases/compiler/a.ts (0 errors) ====
+    class d {
+    }

tests/baselines/reference/declarationFileOverwriteErrorWithOut.js

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+//// [tests/cases/compiler/declarationFileOverwriteErrorWithOut.ts] ////
+
+//// [out.d.ts]
+
+declare class c {
+}
+
+//// [a.ts]
+class d {
+}
+
+//// [out.js]
+var d = (function () {
+    function d() {
+    }
+    return d;
+})();

tests/cases/compiler/declarationFileOverwriteError.ts

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+// @declaration: true
+
+// @Filename: a.d.ts
+declare class c {
+}
+
+// @FileName: a.ts 
+class d {
+}

tests/cases/compiler/declarationFileOverwriteErrorWithOut.ts

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+// @declaration: true
+// @out: tests/cases/compiler/out.js
+
+// @Filename: out.d.ts
+declare class c {
+}
+
+// @FileName: a.ts 
+class d {
+}