foo a, ### comments ### {b: c}

[mozart0]

foo a, ### comments ### {b: c}

PARSE ERROR ON LINE 1: UNEXPECTED 'CALL_END'

bug?

[TrevorBurnham]

It's not ideal, but it's not a bug. An intentional decision was made to require preserved comments to be outside of expressions, because it's a big parsing challenge and it's often unclear where /* comments */ should wind up in the compiled JS. This is why only ### comments are preserved, and those are intended mainly for things like copyright headers. See #41

[mozart0]

Thanks very much!

[satyr]

Try: foo a, (### comments ###; b: c)

[GeoffreyBooth]

foo a, ### comments ### {b: c}

compiles now, via #4572. Sorry it took awhile.