runnableExamples block with except on specified error fails with nim doc

[D-Nice]

Unable to catch specific exception in runnableExamples, as it causes nim doc to fail, however, a general except works fine.

Example

# this proc on its own works fine with `nim doc`
proc goodProc*() =
  runnableExamples:
    try:
      discard
    except:
    # just the general except will work
      discard

# this proc fails with `nim doc`
proc badProc*() =
  runnableExamples:
    try:
      discard
    except IOError:
      # specifying Error is culprit
      discard

Current Output

/tmp/project # nim doc runnableExcept.nim 
Hint: used config file '/nim/config/nim.cfg' [Conf]
Hint: used config file '/nim/config/nimdoc.cfg' [Conf]
Hint: system [Processing]
Hint: widestrs [Processing]
Hint: io [Processing]
Hint: runnableExcept [Processing]
fatal.nim(39)            sysFatal
Error: unhandled exception: sempass2.nim(394, 19) `b.sons[j].kind == nkType`  [AssertionError]

Additional Information

• A working alternative is to import unittest and utilize expect

$ nim -v
Nim Compiler Version 1.0.2 [Linux: amd64]
Compiled at 2019-10-22
Copyright (c) 2006-2019 by Andreas Rumpf

git hash: 193b3c66bbeffafaebff166d24b9866f1eaaac0e
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