JSC_INEXISTENT_PROPERTY_WITH_SUGGESTION is hidden if the inexistent property is set in unrelated code.

[bamtang-dev]

Hello, not sure if this is expected behavior. Below code is minimal sample tested in ADVANCED mode on: https://closure-compiler.appspot.com/

/**
 * @constructor
 * @struct
 */
function SGlobal() {
	this.className = "SGlobal";
}
/** @type {number}*/
SGlobal.scale = 1;

/**
 * @constructor
 * @struct
 * @param {number} x
 */
function ZoomManager(x) {
	this.m_x = x * SGlobal.scale;
}

/**
 * @param {number} time
 * @param {number} x
 */
ZoomManager.prototype.onDisplace = function(time, x) {
	this.m_x = x + time * SGlobal.scaleT; // <--- THIS IS A TYPO, property was 'scale'
};

ZoomManager.prototype.neverCalled = function() {
	//SGlobal.scaleT = 4;
};

var obj = new ZoomManager(10);
obj.onDisplace(0.5, 1);
var dist = obj.m_x;
console.log(dist);

This code has a typo and the compiler correctly points the error:

JSC_INEXISTENT_PROPERTY_WITH_SUGGESTION: Property scaleT never defined on SGlobal. Did you mean scale? at line 25 character 31

But if you are unlucky like me and have a second typo in other unrelated part of your code the warning goes away and no warning or error is printed. Here I put the second typo in a method of the class that is never called

ZoomManager.prototype.neverCalled = function() {
	SGlobal.scaleT = 4;  // <--- SECOND TYPO, replace this code in above example
};

What is interesting is that the compiler somehow knows that the output is undefined because is producing compiled code with NaN:

'use strict';
var a = new function() {
  this.g = 10;
}();
a.g = NaN;
console.log(a.g);

I was under the impression that the compiler warned me whenever an undeclared property of a @struct was tried to use.