Lexer doesn't return a terminal newline token?

[danswartzendruber]

So I was trying to migrate a BISON/FLEX basic parser written in "C" to GO. Settled on goyacc and nex. But was seeing bizarre behavior, where lines were not being processed until I entered a newline again. To eliminate questions about my grammar, I tried building the rp test program, and saw the same behavior. e.g. I enter '111 111 * 3 /', and nothing is printed until I enter another newline (or ctrl-d), at which point it prints the answer. I patched yyDebug to 3 to observe the grammar actions, and saw that it wasn't completing the parse, because the terminal newline was not being returned to the parser.

Output with yyDebug==3:

reduce 1 in:
state-0
111 111 * 3 /
lex NUM(57346)
reduce 5 in:
state-5
lex NUM(57346)
reduce 5 in:
state-5
lex '*'(42)
reduce 8 in:
state-11
lex NUM(57346)
reduce 5 in:
state-5
lex '/'(47)
reduce 9 in:
state-12

(notice how it hasn't printed anything yet?) Now I enter another newline:

lex '\n'(10)
reduce 4 in:
state-6
4107
reduce 2 in:
state-2

and it finishes up.

p.s. I cloned this straight out of github...