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-rw-r--r--050scenario.cc5
1 files changed, 5 insertions, 0 deletions
diff --git a/050scenario.cc b/050scenario.cc
index e35ab0cb..5a1df05d 100644
--- a/050scenario.cc
+++ b/050scenario.cc
@@ -552,6 +552,11 @@ recipe main [
 ]
 +warn: unexpected [d] in trace layer a
 
+//: Minor detail: ignore 'system' calls in scenarios, since anything we do
+//: with them is by definition impossible to test through mu.
+:(after "case _SYSTEM:")
+  if (Current_scenario) break;
+
 //:: Helpers
 
 :(code)