Parser errors for new rest symbol

[nkleemann]

As a german keyboard layout user, thank you very much for: #1087

After experimenting with this I found patterns that trips up the parser:

• "[--"
• "<---"
• "- 2" (as used in $ slow "- 2", $ slow "~ 2" is working fine)

example:

d1
    $ n "[-- 0 5]"
    # s "cpu"

Failed to Stream.streamReplace: Syntax error in sequence: "[-- 0 5]" ^
unexpected end of input expecting sequence, ",", "|" or "]" Return to previous pattern.

[yaxu]

Ah thanks for this, the patch was surprisingly simple, I guess too simple! I'll add some breaking tests to mark this out as a release blocking bug