From dd5bbae055fd34ce2e12ef63f8a261c6b15dc83e Mon Sep 17 00:00:00 2001
From: _ov4 <ov4@ov4.org>
Date: Wed, 21 Oct 2026 05:43:35 +0000
Subject: feat(parser): parse TEMPLATE declarations, template ids and parameter
 packs

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 tests/iii/template-header-errors/case.json   | 36 +++++++++++++++++++++++++
 tests/iii/template-header-errors/program.cps | 39 ++++++++++++++++++++++++++++
 2 files changed, 75 insertions(+)
 create mode 100644 tests/iii/template-header-errors/case.json
 create mode 100644 tests/iii/template-header-errors/program.cps

(limited to 'tests/iii/template-header-errors')

diff --git a/tests/iii/template-header-errors/case.json b/tests/iii/template-header-errors/case.json
new file mode 100644
index 0000000..f74cc0d
--- /dev/null
+++ b/tests/iii/template-header-errors/case.json
@@ -0,0 +1,36 @@
+{
+  "errors": [
+    {
+      "reason": "Duplicate template parameter",
+      "line": 1
+    },
+    {
+      "reason": "template parameter pack must be last",
+      "line": 6
+    },
+    {
+      "reason": "only one parameter pack",
+      "line": 10
+    },
+    {
+      "reason": "TEMPLATE cannot prefix TYPE",
+      "line": 14
+    },
+    {
+      "reason": "Operator templates are not supported",
+      "line": 17
+    },
+    {
+      "reason": "TEMPLATE declarations are only allowed at top level",
+      "line": 23
+    },
+    {
+      "reason": "TEMPLATE declarations are only allowed at top level",
+      "line": 30
+    },
+    {
+      "reason": "Expected '<' after TEMPLATE",
+      "line": 35
+    }
+  ]
+}
diff --git a/tests/iii/template-header-errors/program.cps b/tests/iii/template-header-errors/program.cps
new file mode 100644
index 0000000..73c34a2
--- /dev/null
+++ b/tests/iii/template-header-errors/program.cps
@@ -0,0 +1,39 @@
+TEMPLATE <T, t>
+FUNCTION Duplicate(Value : T) RETURNS T
+    RETURN Value
+ENDFUNCTION
+
+TEMPLATE <Rest..., T>
+PROCEDURE NotLast()
+ENDPROCEDURE
+
+TEMPLATE <A..., B...>
+PROCEDURE TwoPacks()
+ENDPROCEDURE
+
+TEMPLATE <T>
+TYPE Alias = ^T
+
+TEMPLATE <T>
+OVERLOAD FUNCTION OPERATOR+(Value : T) RETURNS T
+    RETURN Value
+ENDFUNCTION
+
+IF TRUE THEN
+    TEMPLATE <T>
+    PROCEDURE Nested(Value : T)
+        OUTPUT 99
+    ENDPROCEDURE
+ENDIF
+
+CLASS Outer
+    TEMPLATE <T>
+    PROCEDURE Member(Value : T)
+    ENDPROCEDURE
+ENDCLASS
+
+TEMPLATE <>
+PROCEDURE Empty()
+ENDPROCEDURE
+
+OUTPUT 0
-- 
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