diff --git a/test/libsolidity/syntaxTests/literalSuffixes/usableAsSuffix/invalid_suffix_called_delete.sol b/test/libsolidity/syntaxTests/literalSuffixes/usableAsSuffix/invalid_suffix_called_delete.sol
new file mode 100644
index 000000000..dd6d9c393
--- /dev/null
+++ b/test/libsolidity/syntaxTests/literalSuffixes/usableAsSuffix/invalid_suffix_called_delete.sol
@@ -0,0 +1,7 @@
+function delete(uint) pure suffix returns (uint) {}
+
+contract C {
+    uint x = 1 delete;
+}
+// ----
+// ParserError 2314: (9-15): Expected identifier but got 'delete'
diff --git a/test/libsolidity/syntaxTests/literalSuffixes/usableAsSuffix/invalid_suffix_called_hex_ambiguous.sol b/test/libsolidity/syntaxTests/literalSuffixes/usableAsSuffix/invalid_suffix_called_hex_ambiguous.sol
new file mode 100644
index 000000000..9a154691a
--- /dev/null
+++ b/test/libsolidity/syntaxTests/literalSuffixes/usableAsSuffix/invalid_suffix_called_hex_ambiguous.sol
@@ -0,0 +1,7 @@
+function hex(uint) pure suffix returns (bytes memory) {}
+
+contract C {
+    bytes b = 1 hex"1234";
+}
+// ----
+// ParserError 2314: (9-12): Expected identifier but got 'ILLEGAL'
diff --git a/test/libsolidity/syntaxTests/literalSuffixes/usableAsSuffix/invalid_suffix_called_new.sol b/test/libsolidity/syntaxTests/literalSuffixes/usableAsSuffix/invalid_suffix_called_new.sol
new file mode 100644
index 000000000..60d64ace9
--- /dev/null
+++ b/test/libsolidity/syntaxTests/literalSuffixes/usableAsSuffix/invalid_suffix_called_new.sol
@@ -0,0 +1,7 @@
+function new(uint) pure suffix returns (uint) {}
+
+contract C {
+    uint x = 1 new;
+}
+// ----
+// ParserError 2314: (9-12): Expected identifier but got 'new'