5B. statement labels and gotos (JUMP)
Labels are global-scoped identifiers with a ':' added to them, as in:


they may be used by instructions such as JUMP, and to reference
static data. They may be used to jump out of all types of loops (although
this technique is not encouraged, (see  5F , EXIT), but not out of
procedures. In normal E programs they are mostly used with inline assembly.
Labels are always globally visible.

Usage of JUMP:	JUMP <label>
continues execution at <label>. You are not encouraged to use this
instruction, it's there for situations that would otherwise increase
the complexity of the program. Example:

IF done THEN JUMP stopnow

/* other parts of program */