guix lint --version
-module_dir="t-guix-lint-$$"
-mkdir "$module_dir"
+# Choose a module directory not below any %LOAD-PATH component. This is
+# necessary when testing '-L' with a relative file name.
+module_dir="$(mktemp -d)"
+
+mkdir -p "$module_dir"
trap "rm -rf $module_dir" EXIT
# Make sure specifying multiple packages works.
guix lint -L $module_dir -c inputs-should-be-native dummy dummy@42 dummy
+
+# Test '-L' with a relative file name. 'guix lint' will see "t-xyz/foo.scm"
+# (instead of "foo.scm") and will thus fail to find it in %LOAD-PATH. Check
+# that it does find it anyway. See <https://bugs.gnu.org/42543>.
+(cd "$module_dir"/.. ; guix lint -c formatting -L "$(basename "$module_dir")" dummy@42) 2>&1 > "$module_dir/out"
+test -z "$(cat "$module_dir/out")"