benchmark/bm_hash_aref_sym*.rb: force static symbols

Dynamic symbols hash more slowly because they need extra method
dispatch in rb_any_hash.  I am not sure if dynamic symbols are
a realistic use case as hash keys, so this commit only
restores performance when comparing against versions of Ruby
which lack dsyms.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47854 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 6 insertions, 1 deletions

diff --git a/benchmark/bm_hash_aref_sym.rb b/benchmark/bm_hash_aref_sym.rb
index 54298ffc9e..f75d163fe6 100644
--- a/benchmark/bm_hash_aref_sym.rb
+++ b/benchmark/bm_hash_aref_sym.rb
@@ -1,4 +1,9 @@
 h = {}
-syms = ('a'..'z').to_a.map(&:to_sym)
+syms = ('a'..'z').to_a
+begin
+  syms = eval("%i[#{syms.join(' ')}]")
+rescue SyntaxError # <= 1.9.3
+  syms.map!(&:to_sym)
+end
 syms.each { |s| h[s] = s }
 200_000.times { syms.each { |s| h[s] } }