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-rw-r--r--tool/lib/core_assertions.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/tool/lib/core_assertions.rb b/tool/lib/core_assertions.rb
index 6769ee7a91..47d711f4fa 100644
--- a/tool/lib/core_assertions.rb
+++ b/tool/lib/core_assertions.rb
@@ -270,6 +270,7 @@ BEGIN {
eom
args = args.dup
args.insert((Hash === args.first ? 1 : 0), "-w", "--disable=gems", *$:.map {|l| "-I#{l}"})
+ args << "--debug" if RUBY_ENGINE == 'jruby' # warning: tracing (e.g. set_trace_func) will not capture all events without --debug flag
stdout, stderr, status = EnvUtil.invoke_ruby(args, src, capture_stdout, true, **opt)
ensure
if res_c