template inner(loc: tuple[filename: string, line: int]) =
  echo loc.filename
template outer() =
  echo instantiationInfo()
  inner(instantiationInfo())

outer()

# $ nim c -r instantiationinfo
# Hint: used config file '/usr/local/Cellar/nim/0.14.2/nim/config/nim.cfg' [Conf]
# Hint: system [Processing]
# Hint: instantiationinfo [Processing]
# instantiationinfo.nim(7, 6) template/generic instantiation from here
# instantiationinfo.nim(5, 8) template/generic instantiation from here
# instantiationinfo.nim(2, 11) Error: undeclared field: 'filename'
#

# If you comment out line 5:
#
# $ nim c -r instantiationinfo
# Hint: used config file '/usr/local/Cellar/nim/0.14.2/nim/config/nim.cfg' [Conf]
# Hint: system [Processing]
# Hint: instantiationinfo [Processing]
# instantiationinfo.nim(1, 10) Hint: 'inner' is declared but not used [XDeclaredButNotUsed]
# Hint:  [Link]
# Hint: operation successful (10316 lines compiled; 0.316 sec total; 15.504MiB; Debug Build) [SuccessX]
# (filename: instantiationinfo.nim, line: 7)