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-rw-r--r--actionpack/lib/action_dispatch/journey/formatter.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/actionpack/lib/action_dispatch/journey/formatter.rb b/actionpack/lib/action_dispatch/journey/formatter.rb
index 0f04839d9b..52396ec901 100644
--- a/actionpack/lib/action_dispatch/journey/formatter.rb
+++ b/actionpack/lib/action_dispatch/journey/formatter.rb
@@ -50,7 +50,7 @@ module ActionDispatch
unmatched_keys = (missing_keys || []) & constraints.keys
missing_keys = (missing_keys || []) - unmatched_keys
- message = "No route matches #{Hash[constraints.sort_by { |k, v| k.to_s }].inspect}".dup
+ message = +"No route matches #{Hash[constraints.sort_by { |k, v| k.to_s }].inspect}"
message << ", missing required keys: #{missing_keys.sort.inspect}" if missing_keys && !missing_keys.empty?
message << ", possible unmatched constraints: #{unmatched_keys.sort.inspect}" if unmatched_keys && !unmatched_keys.empty?