[Issue 23287] New: Invalid @nogc code succeeds when compilation with -o-

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23287

          Issue ID: 23287
           Summary: Invalid @nogc code succeeds when compilation with -o-
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: ibuclaw at gdcproject.org

This is issue 23112, but for when compiling with dmd -o-
---
struct Forward(alias F) 
 {
    auto call()() 
    {
        return F();
    }
}

auto bar(int a) @nogc nothrow @safe 
{
    auto f()
    {
        return a;
    }
    return Forward!f();
}

extern(C) void main() @nogc 
{
    assert(bar(3).call() == 3);
}

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