Re: threads:on + gc:orc = C(!) compiler errors in unit tests

[snej]

Turns out it's pretty trivial to reproduce. I've filed 
[https://github.com/nim-lang/Nim/issues/14865](https://github.com/nim-lang/Nim/issues/14865)
 .
    
    
    $ cat test.nim
    import unittest
    test "foo":
        check 3 + 4 == 7
    $ nim c -r --threads:on --gc:orc test.nim
    Hint: used config file 
'/Users/snej/.choosenim/toolchains/nim-#devel/config/nim.cfg' [Conf]
    Hint: used config file 
'/Users/snej/.choosenim/toolchains/nim-#devel/config/config.nims' [Conf]
    ............................
    
/Users/snej/.choosenim/toolchains/nim-#devel/lib/pure/collections/setimpl.nim(43,
 32) Hint: passing 'n[i].key' to a sink parameter introduces an implicit copy; 
if possible, rearrange your program's control flow to prevent it [Performance]
    CC: test.nim
    /Users/snej/.cache/nim/test_d/@mtest.nim.c:888:88: error: incomplete 
definition of type 'struct tySequence__shvncLWJZ4vpydQXcCi7CA_Content'
                                            formatter__bVJh0BzzmxXcXxRmZHEkHg = 
&NimTV_->formatters__55U7g4zhjHV9bCI6emTgDiA.p->data[i];
                                                                                
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
    ...
    
    
    Run