🚨 StringPrep: more helpful error reporting

Author: nevans

lib/net/imap/sasl/stringprep.rb

@@ -32,10 +32,12 @@ def self.[](table)
     def check_prohibited!(string, *tables, bidi: false, profile: nil)
       tables = TABLE_TITLES.keys.grep(/^C/) if tables.empty?
       tables |= %w[C.8] if bidi
-      table = tables.find {|t| TABLE_REGEXPS[t].match?(string) }
-      raise ProhibitedCodepoint.new(
-        table, string: string, profile: nil
-      ) if table
+      table = tables.find {|t| TABLE_REGEXPS.fetch(t).match?(string) }
+      if table
+        raise ProhibitedCodepoint.new(
+          table, string: string, profile: nil
+        )
+      end
       check_bidi!(string, profile: profile) if bidi
     end