Ensure valid type name for operators with multiple returns. (#796)

* Ensure valid type name for operators with multiple returns.

* Added parent and bracket operator.

* Added test

* Tweak the implementation and run regressions

* Use unused parameter to make tests compile cleanly

---------

Co-authored-by: Ingo Prötel <[email protected]>
Co-authored-by: Ingo Prötel <[email protected]>
Co-authored-by: Herb Sutter <[email protected]>

Author: 4 people

.gitignore

@@ -26,3 +26,4 @@
 *.bin
 *.exe
 source/gen_version.bat
+build*/

regression-tests/pure2-return-tuple-operator.cpp2

@@ -0,0 +1,34 @@
+
+A : type = {
+    operator() : (this) -> (x: int, y: int) = {
+        x = 12;
+        y = 34;
+        return;
+    }
+    operator* : (this) -> (x: int, y: int) = {
+        x = 23;
+        y = 45;
+        return;
+    }
+    operator[] : (this, idx: int) -> (x: int, y: int) = {
+        x = 34 * (idx+1);
+        y = 56 * (idx+1);
+        return;
+    }
+}
+
+
+main : () = {
+
+    a : A  = ();
+
+    t1 := a();
+    std::cout << t1.x << " , " << t1.y << "\n";
+
+    t2 := a*;
+    std::cout << t2.x << " , " << t2.y << "\n";
+
+    t3 := a[0];
+    std::cout << t3.x << " , " << t3.y << "\n";
+
+}

regression-tests/test-results/clang-12/pure2-return-tuple-operator.cpp.execution

@@ -0,0 +1,3 @@
+12 , 34
+23 , 45
+34 , 56

regression-tests/test-results/clang-12/pure2-return-tuple-operator.cpp.output

@@ -0,0 +1,3 @@
+12 , 34
+23 , 45
+34 , 56

regression-tests/test-results/gcc-10/pure2-return-tuple-operator.cpp.execution

@@ -0,0 +1,3 @@
+12 , 34
+23 , 45
+34 , 56

regression-tests/test-results/gcc-10/pure2-return-tuple-operator.cpp.output

@@ -0,0 +1,3 @@
+12 , 34
+23 , 45
+34 , 56

regression-tests/test-results/gcc-13/pure2-return-tuple-operator.cpp.execution

@@ -0,0 +1 @@
+pure2-return-tuple-operator.cpp