Open Radar

 
Summary:

Given a Swift string:
    let code = "uniform mat4 u_mvpMatrix; attribute vec4 a_position; attribute vec4 a_color; varying vec4 v_color; void main() { v_color = a_color; gl_Position = u_mvpMatrix * a_position; }"

This code:
	let utf8String = UnsafePointer<GLchar>(code.cStringUsingEncoding(NSUTF8StringEncoding)!)
Produces random results in utf8String

This code:
        let utf8String = code.cStringUsingEncoding(NSUTF8StringEncoding)!
        let unsafeString = UnsafePointer<GLchar>(utf8String)
Produces the expected result.

Steps to Reproduce:
Run the tests in the attach project.

Note the test `testFailsRandomly`, which contains the first example above,  fails about 99% of the time while the test `testNeverFails` never fails. The `testFailsRandomly` generally succeeds once after restarting Xcode.

Expected Results:
Both tests should succeed. The combined expression should yield the same results as the two-step expression.

Actual Results:
The single line expression generates garbage.