Disable the #{} reader macro if a dispatch macro already exists on #\{ #132
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I ran into a problem when using TR with my curly-fn meta-language, which installs its own dispatch macro on
#\{
. Since TR already uses that for annotations, this was overridden.This implements @samth's idea thrown out on IRC to simply disable installing the readtable if a mapping already exists for
#\{
. This should never conflict with existing code, since the only way to modify a#lang
readtable is through meta-langs, which are fairly rare as-is.