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-rw-r--r--actionpack/lib/action_dispatch/routing/route_set.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/actionpack/lib/action_dispatch/routing/route_set.rb b/actionpack/lib/action_dispatch/routing/route_set.rb
index 07d3a41173..acce8a7ef3 100644
--- a/actionpack/lib/action_dispatch/routing/route_set.rb
+++ b/actionpack/lib/action_dispatch/routing/route_set.rb
@@ -245,7 +245,7 @@ module ActionDispatch
missing_keys << missing_key
}
constraints = Hash[@route.requirements.merge(params).sort_by { |k, v| k.to_s }]
- message = "No route matches #{constraints.inspect}".dup
+ message = +"No route matches #{constraints.inspect}"
message << ", missing required keys: #{missing_keys.sort.inspect}"
raise ActionController::UrlGenerationError, message