[ruby/irb] Symbol.all_symbols was adopted by Ruby 1.8.0 or later

https://github.com/ruby/irb/commit/71ba754e8e

1 files changed, 6 insertions, 10 deletions

diff --git a/lib/irb/completion.rb b/lib/irb/completion.rb
index c44aa9039e..0d5420bc75 100644
--- a/lib/irb/completion.rb
+++ b/lib/irb/completion.rb
@@ -97,17 +97,13 @@ module IRB
       when /^(:[^:.]*)$/
         # Symbol
         return nil if doc_namespace
-        if Symbol.respond_to?(:all_symbols)
-          sym = $1
-          candidates = Symbol.all_symbols.collect do |s|
-            ":" + s.id2name.encode(Encoding.default_external)
-          rescue Encoding::UndefinedConversionError
-            # ignore
-          end
-          candidates.grep(/^#{Regexp.quote(sym)}/)
-        else
-          []
+        sym = $1
+        candidates = Symbol.all_symbols.collect do |s|
+          ":" + s.id2name.encode(Encoding.default_external)
+        rescue Encoding::UndefinedConversionError
+          # ignore
         end
+        candidates.grep(/^#{Regexp.quote(sym)}/)
 
       when /^::([A-Z][^:\.\(]*)$/
         # Absolute Constant or class methods