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diff --git a/src/cmd/ksh93/sh/xec.c b/src/cmd/ksh93/sh/xec.c
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--- a/src/cmd/ksh93/sh/xec.c
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+++ b/src/cmd/ksh93/sh/xec.c
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@@ -3529,7 +3529,7 @@ int sh_funscope(int argn, char *argv[],int(*fun)(void*),void *arg,int execflg)
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 	}
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 	if(jmpval)
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 		r=shp->exitval;
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-	if(r>SH_EXITSIG && ((r&SH_EXITMASK)==SIGINT || ((r&SH_EXITMASK)==SIGQUIT)))
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+	if(r>SH_EXITSIG && ((r&SH_EXITMASK)==SIGINT || ((r&SH_EXITMASK)==SIGQUIT) || (getenv("_AST_KSH_SIGNAL_BUBBLE"))))
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 		kill(getpid(),r&SH_EXITMASK);
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 	if(jmpval > SH_JMPFUN)
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 	{