Declaring a invalid function signature produce a nil exception

[icaaro]

When a try to run a sdkgen with the code below this produce a nil exception fired by the crystal.

function funcName(param1: string):

Error Logging

Unhandled exception: Nil assertion failed (Exception)
  from /usr/lib/crystal/class.cr:148:0 in 'not_nil!'
  from /home/icaro/cubos/sdkgen/src/syntax/token.cr:0:3 in 'filename'
  from /home/icaro/cubos/sdkgen/src/syntax/token.cr:11:5 in 'location'
  from /home/icaro/cubos/sdkgen/src/syntax/parser.cr:289:35 in 'parse_type'
  from /home/icaro/cubos/sdkgen/src/syntax/parser.cr:211:7 in 'parse_operation'
  from /home/icaro/cubos/sdkgen/src/syntax/parser.cr:49:9 in 'parse'
  from /home/icaro/cubos/sdkgen/src/main.cr:38:9 in '__crystal_main'
  from /usr/lib/crystal/crystal/main.cr:97:5 in 'main_user_code'
  from /usr/lib/crystal/crystal/main.cr:86:7 in 'main'
  from /usr/lib/crystal/crystal/main.cr:106:3 in 'main'
  from __libc_start_main
  from _start
  from ???