1 files changed, 32 insertions, 0 deletions
diff --git a/unit-tests/cmd-errors-lint.mk b/unit-tests/cmd-errors-lint.mk
new file mode 100644
index 000000000000..371e12af0f4f
--- /dev/null
+++ b/unit-tests/cmd-errors-lint.mk
@@ -0,0 +1,32 @@
+# $NetBSD: cmd-errors-lint.mk,v 1.1 2020/11/02 20:43:27 rillig Exp $
+#
+# Demonstrate how errors in variable expansions affect whether the commands
+# are actually executed.
+
+.MAKEFLAGS: -dL
+
+all: undefined unclosed-variable unclosed-modifier unknown-modifier end
+
+# Undefined variables are not an error.  They expand to empty strings.
+undefined:
+	: $@ ${UNDEFINED}
+
+# XXX: As of 2020-11-01, this obvious syntax error is not detected.
+# XXX: As of 2020-11-01, this command is executed even though it contains
+# parse errors.
+unclosed-variable:
+	: $@ ${UNCLOSED
+
+# XXX: As of 2020-11-01, this obvious syntax error is not detected.
+# XXX: As of 2020-11-01, this command is executed even though it contains
+# parse errors.
+unclosed-modifier:
+	: $@ ${UNCLOSED:
+
+# XXX: As of 2020-11-01, this command is executed even though it contains
+# parse errors.
+unknown-modifier:
+	: $@ ${UNKNOWN:Z}
+
+end:
+	: $@