1 files changed, 25 insertions, 0 deletions
diff --git a/tests/ui/proc-macro/three-equals.rs b/tests/ui/proc-macro/three-equals.rs
new file mode 100644
index 00000000000..21b137c99a7
--- /dev/null
+++ b/tests/ui/proc-macro/three-equals.rs
@@ -0,0 +1,25 @@
+// aux-build:three-equals.rs
+
+extern crate three_equals;
+
+use three_equals::three_equals;
+
+fn main() {
+    // This one is okay.
+    three_equals!(===);
+
+    // Need exactly three equals.
+    three_equals!(==); //~ ERROR found 2 equal signs, need exactly 3
+
+    // Need exactly three equals.
+    three_equals!(=====); //~ ERROR expected EOF
+
+    // Only equals accepted.
+    three_equals!(abc); //~ ERROR expected `=`
+
+    // Only equals accepted.
+    three_equals!(!!); //~ ERROR expected `=`
+
+    // Only three characters expected.
+    three_equals!(===a); //~ ERROR expected EOF
+}