idlwave-shell-overlay-arrow

idlwave-shell-overlay-arrow is a variable defined in `idlw-shell.el'.
Its value is

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Documentation:
The overlay arrow to display at source lines where execution halts.
We use a single character by default, since the main block of IDL procedures
often has no indentation. Where possible, IDLWAVE will use overlays to
display the stop-lines. The arrow is only used on character-based terminals.
See also `idlwave-shell-use-overlay-arrow'.

You can customize this variable.