[EXPERIMENTAL] is this makefile even testing anything

Author: jieyouxu

tests/run-make/print-target-list/Makefile

@@ -4,5 +4,5 @@ include ../tools.mk
 # target specifications
 all:
 	for target in $(shell $(BARE_RUSTC) --print target-list); do \
-		$(BARE_RUSTC) --target $$target --print sysroot; \
+		$(BARE_RUSTC) --target $$target --print sysroot || exit 1; \
 	done