As reported in #1101, data readers which do not exist in non-selected reader conditional forms can prevent reading completely:
basilisp.user=> #?(:cljs #js [] :default [])
exception: <class 'basilisp.lang.reader.SyntaxError'>
message: No data reader found for tag #js
line: 1:15
As reported in #1101, data readers which do not exist in non-selected reader conditional forms can prevent reading completely: