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diff --git a/tests/typ/control/let-invalid.typ b/tests/typ/control/let-invalid.typ
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+// Test invalid let binding syntax.
+
+---
+// Error: 5 expected identifier
+#let
+
+// Error: 6-9 expected identifier, found string
+#let "v"
+
+// Should output `1`.
+// Error: 7 expected semicolon or line break
+#let v 1
+
+// Error: 9 expected expression
+#let v =
+
+---
+// Should output `= 1`.
+// Error: 6-9 expected identifier, found string
+#let "v" = 1