The special chars that look most promising to me as single chars:
> \ = often means "continue on next line" when at eol in other languages
This is one I've been using, and as noted earlier, it already has a meaning to
many readers.
> ~ = mostly unused except in Arc, where ~foo means "the function foo
> with its output notted" and ~ means "the not function"; otherwise
> valid function name
> ^ = otherwise valid function name (superscript? even infix
> exponentiation or XOR operator: {a ^ b})
They don't have to be single characters, though. The current "group" marker is
already multiple characters. Plausible special abbreviations could include:
~~
^^
--
Since "." is unlikely to occur at the beginning of a line, that's plausible as
a group marker, but as I described earlier I don't think we should use it in
the middle (e.g., for splits).
Maybe we can divide this discussion into two areas:
1. Which symbols can we use for special operations, e.g., ~
2. What semantics should we use. Perhaps we can use placeholders SYMBOL1,
SYMBOL2, SYMBOL3 when we don't care.
--- David A. Wheeler
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