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-rw-r--r--lib/tracer.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/tracer.rb b/lib/tracer.rb
index a0b4fdf133d..318b254ac85 100644
--- a/lib/tracer.rb
+++ b/lib/tracer.rb
@@ -190,6 +190,6 @@ if $0 == __FILE__
ARGV.shift
Tracer.on
require $0
-elsif caller.size <= 1
+elsif caller.count {|bt| /\A<internal:[^<>]+>:/ !~ bt} <= 1
Tracer.on
end