runnableExamples doesn't work at module level

[timotheecour]

runnableExamples:
  doAssert true

proc foo*()=
  ## mydoc
  runnableExamples:
    doAssert 1==1
  discard

nim_cmd=doc rnim bugs/doc/t02_runnableExamples_toplevel2.nim
nim doc --nimcache:/tmp/nim//nimcache/ -o:/tmp/nim//app.html bugs/doc/t02_runnableExamples_toplevel2.nim
Hint: used config file '/Users/timothee/git_clone/nim/Nim/config/nim.cfg' [Conf]
Hint: used config file '/Users/timothee/.config/nim.cfg' [Conf]
Hint: [Link]
Hint: operation successful (12232 lines compiled; 0.710 sec total; 16.309MiB peakmem; Debug Build) [SuccessX]
Hint: /private/tmp/nim/nimcache/runnableExamples/t02_runnableExamples_toplevel2_examples [Exec]
Hint: operation successful: runnableExamples: /tmp/nim//nimcache/runnableExamples/t02_runnableExamples_toplevel2_examples.nim [Success]
Hint: operation successful (13716 lines compiled; 0.967 sec total; 15.82MiB peakmem; Debug Build) [SuccessX]
/tmp/nim//app.html