From ea15647ba6bccb5ac48de5f4b80b8c2769d69b8f Mon Sep 17 00:00:00 2001
From: Yong He <yonghe@outlook.com>
Date: Fri, 7 Apr 2023 10:12:00 -0700
Subject: Diagnose on attempt to specialize with interface type. (#2780)

* Diagnose on attempt to specialize with interface type.

Fixes ##1445.

* Enable fixed test.

* Fix test.

* Fix.

---------

Co-authored-by: Yong He <yhe@nvidia.com>
---
 .../diagnostics/generic-type-inference-fail.slang  | 81 ++++++++++++++++++++++
 .../generic-type-inference-fail.slang.expected     |  9 +++
 2 files changed, 90 insertions(+)
 create mode 100644 tests/diagnostics/generic-type-inference-fail.slang
 create mode 100644 tests/diagnostics/generic-type-inference-fail.slang.expected

(limited to 'tests/diagnostics')

diff --git a/tests/diagnostics/generic-type-inference-fail.slang b/tests/diagnostics/generic-type-inference-fail.slang
new file mode 100644
index 000000000..803c7584c
--- /dev/null
+++ b/tests/diagnostics/generic-type-inference-fail.slang
@@ -0,0 +1,81 @@
+//DIAGNOSTIC_TEST:SIMPLE:
+
+interface IAssoc
+{
+    int Compute();
+}
+
+interface IInterface
+{
+    associatedtype TAssoc : IAssoc;
+
+    [mutating]
+    void SetVal(int inVal);
+
+    TAssoc GetAssoc();
+};
+
+T.TAssoc CreateT_Assoc_Inner<T:IInterface>(int inVal)
+{
+    T obj;
+    obj.SetVal(inVal);
+    return obj.GetAssoc();
+}
+
+T.TAssoc CreateT_Assoc<T:IInterface>(int inVal)
+{
+    return CreateT_Assoc_Inner<T>(inVal);
+}
+
+T CreateT<T:IInterface>(int inVal)
+{
+    T obj;
+    obj.SetVal(inVal);
+    return obj;
+}
+
+struct Impl : IInterface
+{
+    struct TAssoc : IAssoc
+    {
+        int base;
+        int Compute()
+        {
+            return base;
+        }
+    };
+
+    TAssoc assoc;
+    [mutating]
+    void SetVal(int inVal)
+    {
+        assoc.base = inVal;
+    }
+
+    TAssoc GetAssoc()
+    {
+        return assoc;
+    }
+};
+
+int test()
+{
+    var obj = CreateT<Impl>(2);
+    var obj2 = CreateT_Assoc<Impl>(1);
+    
+    var obj3 = CreateT_Assoc_Inner(1); // ERROR.
+
+    return obj.GetAssoc().Compute() + obj2.Compute() + obj3.Compute();
+}
+
+
+//TEST_INPUT:ubuffer(data=[0 1 2 3], stride=4):out,name=outputBuffer
+RWStructuredBuffer<int> outputBuffer : register(u0);
+
+[numthreads(4, 1, 1)]
+void computeMain(uint3 dispatchThreadID : SV_DispatchThreadID)
+{
+    uint tid = dispatchThreadID.x;
+    int outVal = test();
+    outputBuffer[tid] = outVal;
+}
\ No newline at end of file
diff --git a/tests/diagnostics/generic-type-inference-fail.slang.expected b/tests/diagnostics/generic-type-inference-fail.slang.expected
new file mode 100644
index 000000000..3f9753d68
--- /dev/null
+++ b/tests/diagnostics/generic-type-inference-fail.slang.expected
@@ -0,0 +1,9 @@
+result code = -1
+standard error = {
+tests/diagnostics/generic-type-inference-fail.slang(66): error 39999: could not specialize generic for arguments of type (int)
+    var obj3 = CreateT_Assoc_Inner(1); // ERROR.
+                                  ^
+tests/diagnostics/generic-type-inference-fail.slang(18): note 39999: see declaration of func CreateT_Assoc_Inner<T>(int) -> T.TAssoc
+}
+standard output = {
+}
-- 
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