From 0f5e9f00b07606871a6289060fa904555d41ae7d Mon Sep 17 00:00:00 2001
From: Eugen Wissner <belka@caraus.de>
Date: Mon, 31 Aug 2026 17:18:39 +0200
Subject: Reject comparison of uncompatible types

---
 testsuite/fail_compilation/assign_void_call.elna        |  9 +++++++++
 .../fail_compilation/compare_unrelated_records.elna     | 17 +++++++++++++++++
 .../fail_compilation/proc_type_without_parameters.elna  |  9 +++++++++
 .../fail_compilation/record-base-cycle-indirect.elna    | 13 +++++++++++++
 4 files changed, 48 insertions(+)
 create mode 100644 testsuite/fail_compilation/assign_void_call.elna
 create mode 100644 testsuite/fail_compilation/compare_unrelated_records.elna
 create mode 100644 testsuite/fail_compilation/proc_type_without_parameters.elna
 create mode 100644 testsuite/fail_compilation/record-base-cycle-indirect.elna

(limited to 'testsuite/fail_compilation')

diff --git a/testsuite/fail_compilation/assign_void_call.elna b/testsuite/fail_compilation/assign_void_call.elna
new file mode 100644
index 0000000..d18b1c8
--- /dev/null
+++ b/testsuite/fail_compilation/assign_void_call.elna
@@ -0,0 +1,9 @@
+var
+  x: Int
+
+proc v()
+return
+
+begin
+  x := v() (* @Error Expected type 'Int', but the expression has no value *)
+end.
diff --git a/testsuite/fail_compilation/compare_unrelated_records.elna b/testsuite/fail_compilation/compare_unrelated_records.elna
new file mode 100644
index 0000000..71eaeda
--- /dev/null
+++ b/testsuite/fail_compilation/compare_unrelated_records.elna
@@ -0,0 +1,17 @@
+type
+  A = record
+    x: Int
+  end
+  B = record
+    y: Int;
+    z: Int
+  end
+
+var
+  a: A
+  b: B
+  ok: Bool
+
+begin
+  ok := b = a (* @Error Invalid operands of type 'B' and 'A' for operator = *)
+end.
diff --git a/testsuite/fail_compilation/proc_type_without_parameters.elna b/testsuite/fail_compilation/proc_type_without_parameters.elna
new file mode 100644
index 0000000..92514f6
--- /dev/null
+++ b/testsuite/fail_compilation/proc_type_without_parameters.elna
@@ -0,0 +1,9 @@
+var
+  x: Int
+
+proc f()
+return
+
+begin
+  x := f (* @Error Expected type 'Int', but got 'proc\(\)' *)
+end.
diff --git a/testsuite/fail_compilation/record-base-cycle-indirect.elna b/testsuite/fail_compilation/record-base-cycle-indirect.elna
new file mode 100644
index 0000000..412e6ea
--- /dev/null
+++ b/testsuite/fail_compilation/record-base-cycle-indirect.elna
@@ -0,0 +1,13 @@
+type
+  A = record(B)
+    x: Int
+  end
+  B = record(A) (* @Error Type declaration forms a cycle: A -> B -> A *)
+    y: Int
+  end
+
+var
+  v: A
+
+begin
+end.
-- 
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