Last line can't be a comment

[lagartoflojo]

A template like this:

name @child.name
# a comment on the last line

breaks with:

(...)/show.json.json_builder:3: syntax error, unexpected keyword_ensure, expecting '}'
(...)/show.json.json_builder:5: syntax error, unexpected keyword_end, expecting '}'

This does not happen if there's at least one empty line after the comment:

name @child.name
# a comment on the last line