naruse	2018-03-28 21:54:26 +0900 (Wed, 28 Mar 2018)

  New Revision: 63007

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=63007

  Log:
    fix r62970 as r62990

  Modified files:
    branches/ruby_2_5/lib/tmpdir.rb
Index: ruby_2_5/lib/tmpdir.rb
===================================================================
--- ruby_2_5/lib/tmpdir.rb	(revision 63006)
+++ ruby_2_5/lib/tmpdir.rb	(revision 63007)
@@ -114,9 +114,9 @@ class Dir https://github.com/ruby/ruby/blob/trunk/ruby_2_5/lib/tmpdir.rb#L114
       end
       n = nil
       prefix, suffix = basename
-      prefix = prefix.delete("#{File::SEPARATOR}#{File::ALT_SEPARATOR}")
       prefix = (String.try_convert(prefix) or
                 raise ArgumentError, "unexpected prefix: #{prefix.inspect}")
+      prefix = prefix.delete("#{File::SEPARATOR}#{File::ALT_SEPARATOR}")
       suffix &&= (String.try_convert(suffix) or
                   raise ArgumentError, "unexpected suffix: #{suffix.inspect}")
       suffix &&= suffix.delete("#{File::SEPARATOR}#{File::ALT_SEPARATOR}")

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