Reported on Audacity 2.1.2, Mac OS X 10.11.6
Also occurs on Audacity 2.1.3 alpha, Debian Stable.

Multi-line Nyquist input with SAL syntax doesn't work.

Example:

define variable myosc = hzosc(300)
return myosc

Error: Your code looks like SAL syntax, but there is no return statement etc.

trying:

define variable myosc = hzosc(300) return myosc

works fine.

Workaround (tested on Debian with Audacity 2.1.3 alpha):

Make the code type explicit by adding the ;codetype
header as the first line. Example:

;codetype sal
define variable myosc = hzosc(300)
return myosc