/0 is the same as function() end but better

Author: daurnimator

lpeg_patterns/email.lua

@@ -34,7 +34,7 @@ local comment = P {
 	ccontent = ctext + quoted_pair + V"comment" ;
 	comment = P"("* (FWS^-1 * V"ccontent")^0 * FWS^-1 * P")";
 }
-local CFWS = ((FWS^-1 * comment)^1 * FWS^-1 + FWS ) / function() end
+local CFWS = ((FWS^-1 * comment)^1 * FWS^-1 + FWS ) / 0
 
 -- Atom
 local specials      = S[=[()<>@,;:\".[]]=]

lpeg_patterns/http/origin.lua

@@ -9,7 +9,7 @@ local C = lpeg.C
 local P = lpeg.P
 
 -- discard captures from scheme, host, port and just get whole string
-local serialized_origin = C(uri.scheme * P"://" * uri.host * (P":" * uri.port)^-1/function() end)
+local serialized_origin = C(uri.scheme * P"://" * uri.host * (P":" * uri.port)^-1/0)
 local origin_list = serialized_origin * (core.SP * serialized_origin)^0
 local origin_list_or_null = P"null" + origin_list
 local Origin = http_core.OWS * origin_list_or_null * http_core.OWS

lpeg_patterns/language.lua

@@ -77,6 +77,6 @@ local irregular = P"en-GB-oed"
 
 M.Language_Tag = C((M.langtag
 	+ M.privateuse
-	+ irregular) / function() end) -- capture the whole tag. throws away decomposition
+	+ irregular) / 0) -- capture the whole tag. throws away decomposition
 
 return M