Turn on ASAN for macOS regress.

regress/Makefile

@@ -14,8 +14,7 @@ all:
 		rm -f "$$log"; \
 		printf '%-40s ' "$$test"; \
 		start=$$(date +%s); \
-		ASAN_OPTIONS="abort_on_error=1:detect_leaks=0:$$ASAN_OPTIONS"; \
-		env -i LC_CTYPE=C.UTF-8 ASAN_OPTIONS="$$ASAN_OPTIONS" \
+		env -i LC_CTYPE=C.UTF-8 MallocNanoZone=0 \
 		    sh -x "$$test" >"$$log" 2>&1; \
 		if [ $$? -eq 0 ]; then \
 			end=$$(date +%s); \

regress/format-variables.sh

@@ -296,7 +296,7 @@ sleep 1
 # write end of a FIFO open, so client_* variables have a client to read.
 rm -f "$FIFO"
 mkfifo "$FIFO" || exit 1
-sleep 30 >"$FIFO" &
+while :; do sleep 1; done >"$FIFO" &
 HOLD=$!
 $TMUX -C attach -t cov <"$FIFO" >/dev/null 2>&1 &
 CC=$!