[[FIX]] Correct location reported for directive

Extend the internal data structure used to track directives so that it
can be used to correctly report location information. Document the type
of this structure in the source file where it is initialized.

src/jshint.js

@@ -2054,8 +2054,7 @@ var JSHINT = (function() {
         error("E065", state.tokens.curr);
       }
 
-      // there's no directive negation, so always set to true
-      state.directive[directive] = true;
+      state.directive[directive] = state.tokens.curr;
 
       parseFinalSemicolon(current);
     }
@@ -6509,7 +6508,7 @@ var JSHINT = (function() {
 
         if (state.directive["use strict"]) {
           if (!state.allowsGlobalUsd()) {
-            warning("W097", state.tokens.prev);
+            warning("W097", state.directive["use strict"]);
           }
         }
 

src/state.js

@@ -10,7 +10,7 @@ var state = {
    * @returns {boolean}
    */
   isStrict: function() {
-    return this.directive["use strict"] || this.inClassBody ||
+    return !!this.directive["use strict"] || this.inClassBody ||
       this.option.module || this.option.strict === "implied";
   },
 
@@ -177,6 +177,10 @@ var state = {
     this.esVersion = 5;
     this.funct = null;
     this.ignored = {};
+    /**
+     * A lookup table for active directives whose keys are the value of the
+     * directives and whose values are the tokens which enabled the directives.
+     */
     this.directive = Object.create(null);
     this.jsonMode = false;
     this.lines = [];

tests/unit/options.js

@@ -2046,6 +2046,19 @@ exports.strict = function (test) {
     .addError(1, 6, "Missing \"use strict\" statement.")
     .test("a = 2;", { strict: "global" });
 
+  TestRun(test, "Warning location, missing semicolon (gh-3528)")
+    .addError(1, 1, "Use the function form of \"use strict\".")
+    .addError(1, 13, "Missing semicolon.")
+    .test("'use strict'\n");
+
+  TestRun(test, "Warning location among other directives")
+    .addError(2, 1, "Use the function form of \"use strict\".")
+    .test([
+      "'use another-directive';",
+      "'use strict';",
+      "'use a-third-directive';"
+    ]);
+
   test.done();
 };