rjmccall added a comment.
The formation restrictions on ARC writeback conversions probably make this
more-or-less impossible to test, but I can try to explain when they happen.
They happen when you have an argument of type "id __strong *" and pass it as a
parameter of type "id __autoreleasing *". __strong is the default for
variables, and __autoreleasing is the default for pointer-to-id parameters, so
basically you need something like:
void test(int opaque) {
extern void foo(id*);
id x;
id y;
foo(opaque ? &x : &y);
}
or any other expression that forms a sufficiently complex argument of type "id
__strong *" prior to writeback conversion.
https://reviews.llvm.org/D24712
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