Test case for property used in destructuring variable declaration

tests/baselines/reference/unusedLocalProperty.errors.txt

@@ -0,0 +1,18 @@
+tests/cases/compiler/unusedLocalProperty.ts(3,25): error TS6138: Property 'species' is declared but never used.
+
+
+==== tests/cases/compiler/unusedLocalProperty.ts (1 errors) ====
+    declare var console: { log(msg: any): void; }
+    class Animal {
+        constructor(private species: string) {
+                            ~~~~~~~
+!!! error TS6138: Property 'species' is declared but never used.
+        }
+    
+        printSpecies() {
+            let { species } = this;
+            console.log(species);
+        }
+    }
+    
+    

tests/baselines/reference/unusedLocalProperty.js

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+//// [unusedLocalProperty.ts]
+declare var console: { log(msg: any): void; }
+class Animal {
+    constructor(private species: string) {
+    }
+
+    printSpecies() {
+        let { species } = this;
+        console.log(species);
+    }
+}
+
+
+
+//// [unusedLocalProperty.js]
+var Animal = (function () {
+    function Animal(species) {
+        this.species = species;
+    }
+    Animal.prototype.printSpecies = function () {
+        var species = this.species;
+        console.log(species);
+    };
+    return Animal;
+}());

tests/cases/compiler/unusedLocalProperty.ts

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+//@noUnusedLocals:true
+declare var console: { log(msg: any): void; }
+class Animal {
+    constructor(private species: string) {
+    }
+
+    printSpecies() {
+        let { species } = this;
+        console.log(species);
+    }
+}
+