replace tokens starting with @ during scanning/sizing-up of []-blocks
@word look up word as in $word
@(...) evaluate braces
@[...] evaluate braces and look up result
@"..." parse quotes
in nested []-blocks, use multiple @ to determine time of replacement
(for example, @@@word is replaced when found inside three nested braces)
in regular $-lookup, $[...] now evaluates the braces before lookup
ac-stef
ffee440fa0