RETURN

Returns from a subroutine that was entered with GOSUB. Execution resumes at the statement after the GOSUB call.

Note: RETURN is only valid while servicing a GOSUB.; Using RETURN outside a GOSUB context is an error.; GOSUB/RETURN are kept for compatibility and are deprecated.; Prefer structured procedures: DEF PROCname(...) ... ENDPROC, called with PROCname(...).

RETURN takes no arguments.
Nested subroutines are supported: each GOSUB must eventually reach a RETURN, which returns to its own caller.
RETURN is not used to exit PROC or FN:
- Procedures end with ENDPROC.
- Functions return a value on a line that begins with =.

Simple subroutine

PRINT "Start"
GOSUB 1000
PRINT "Back in main code"
END
 
PRINT "Inside subroutine"
RETURN

Nested GOSUBs

PRINT "Main"
GOSUB 1000
PRINT "Done"
END
 
PRINT "First level"
GOSUB 2000
PRINT "Back to first level"
RETURN
 
PRINT "Second level"
RETURN

Error: RETURN without GOSUB (do not do this)

10 RETURN

Here’s a concise section matching your style:

Loops (FOR, WHILE, REPEAT) are scoped to the current GOSUB.

Any active loops created inside a GOSUB are discarded when RETURN is executed unless they have already been exited normally.

If execution continues and a loop-closing statement is encountered with no matching loop, a runtime error is raised (e.g. NEXT without FOR).

This differs from BBC BASIC, where loops created inside a GOSUB could leak into the caller and corrupt the loop stack.