jashkenas/coffee-script — Issue #1898: foo a, ### comments ### { \n
Author: mozart0
Created: 2011-11-28 03:11:30+00:00
State: open

foo a, ### comments ### {
b: c
}
PARSE ERROR ON LINE 1: UNEXPECTED 'CALL_END'

but these are ok:
foo a, ### comments ### { b: c }
foo a, ### comments ### \
{
b: c
}