[Issue 19235] New: Repeatedly calling non-pure function in non-pure literal nested in pure function is broken

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19235

          Issue ID: 19235
           Summary: Repeatedly calling non-pure function in non-pure
                    literal nested in pure function is broken
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: johannespfau at gmail.com

The test case is much simpler than the title:

-------------------------------------------------
struct FloatingPointControl
{
    void foo() pure
    {
            auto impl = function bool() {
                setControlState(0);
                setControlState(0);
                return 0;
            };
    }

private:
    static void setControlState(uint newState)
    {
    }
}
-------------------------------------------------

dmd -c test.d
test.d(7): Error: pure function test.FloatingPointControl.foo cannot call
impure function test.FloatingPointControl.setControlState

Comment one of the setControlState calls and the test case compiles.

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