New Issue: LLVM Assertion Error in C interoperability example

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18022, "ShreyasKhandekar", "LLVM Assertion Error in C interoperability example", "2021-07-01T20:20:39Z"

There seems to be some issue with the LLVM back-end on a case I am coming across with an example to demonstrate Chapel's interoperability with C.

I was trying a simple struct example:
The Chapel file is:

extern record data{
    var x: c_int;
}
extern proc getNewData() : data;

var d :data;
d = getNewData();

The .h file is:

typedef struct _data data;
data getNewData(void);

and the .c file is:

struct _data {
    int  x;
};
data getNewData(){
    data *d = malloc(sizeof(data));
    d->x = 5;
    return *d;
}

I have omitted some boilerplate code from all files like #ifndefs and the necessarry includes
With the above files, I got the following error during compilation:

internal error: assertion error [llvm/clangUtil.cpp:2922]

It does not matter if I return a pointer (and use the ref intent) or just return the struct itself. I get the same error.

The way to fix this was to move the struct definition completely into the header file instead of the C file.
But I believe it should also work if the struct definition is in the C file.