https://issues.dlang.org/show_bug.cgi?id=19578

          Issue ID: 19578
           Summary: Generated function parameter names may shadow existing
                    symbols
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Severity: minor
          Priority: P1
         Component: dmd
          Assignee: nobody@puremagic.com
          Reporter: snarwin+bugzilla@gmail.com

The following program should print "free variable", but instead prints "parameter":

---
import std.stdio;

string _param_0 = "free variable";

void fun(string)
{
    writeln(_param_0);
}

void main()
{
    fun("parameter");
}
---

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