Add tests

regression-tests/pure2-nested-ifs-error.cpp2

@@ -0,0 +1,27 @@
+main: (args) = {
+    p : *int;
+
+    a := 1;
+    b := 2;
+    c := 3;
+    d := 4;
+
+    if args.argc == 3 {
+        p = a&;
+    } else if b > 2 {
+        if args.argc == 2 {
+            p = c&;
+        } else {
+            if b > 0 {
+                p = a&;
+            } 
+            else {
+                p = d&;
+            }
+        }
+    } else {
+        // p = c&;
+    }
+
+    std::cout << p* << std::endl;
+}

regression-tests/pure2-nested-ifs.cpp2

@@ -0,0 +1,39 @@
+main: (args) = {
+    p : *int;
+
+    a := 1;
+    b := 2;
+    c := 3;
+    d := 4;
+
+    if args.argc > 20 {
+        c = 20;
+    } else if args.argc > 10 {
+        c = 10;
+    } else {
+        if args.argc % 2 {
+            b = 2;
+        } else {
+            b = 1;
+        }
+    }
+
+    if args.argc == 3 {
+        p = a&;
+    } else if b > 2 {
+        if args.argc == 2 {
+            p = c&;
+        } else {
+            if b > 0 {
+                p = a&;
+            } 
+            else {
+                p = d&;
+            }
+        }
+    } else {
+        p = c&;
+    }
+
+    std::cout << p* << std::endl;
+}

regression-tests/test-results/apple-clang-14/pure2-nested-ifs.cpp.execution

@@ -0,0 +1 @@
+3

regression-tests/test-results/clang-12/pure2-nested-ifs.cpp.execution

@@ -0,0 +1 @@
+3

regression-tests/test-results/gcc-10/pure2-nested-ifs.cpp.execution

@@ -0,0 +1 @@
+3

regression-tests/test-results/msvc-2022/pure2-nested-ifs.cpp.execution

@@ -0,0 +1 @@
+3

regression-tests/test-results/pure2-nested-ifs-error.cpp2.output

@@ -0,0 +1,9 @@
+pure2-nested-ifs-error.cpp2...
+pure2-nested-ifs-error.cpp2(2,5): error: local variable p must be initialized on both branches or neither branch
+pure2-nested-ifs-error.cpp2(9,5): error: "if" initializes p on:
+  branch starting at line 9
+  branch starting at line 11
+but not on:
+  branch starting at line 22
+  ==> program violates initialization safety guarantee - see previous errors
+

regression-tests/test-results/pure2-nested-ifs.cpp

@@ -0,0 +1,61 @@
+
+#define CPP2_USE_MODULES         Yes
+
+//=== Cpp2 type declarations ====================================================
+
+
+#include "cpp2util.h"
+
+
+
+//=== Cpp2 type definitions and function declarations ===========================
+
+#line 1 "pure2-nested-ifs.cpp2"
+auto main(int const argc_, char const* const* const argv_) -> int;
+
+
+//=== Cpp2 function definitions =================================================
+
+#line 1 "pure2-nested-ifs.cpp2"
+auto main(int const argc_, char const* const* const argv_) -> int{
+    auto args = cpp2::make_args(argc_, argv_); 
+#line 2 "pure2-nested-ifs.cpp2"
+    cpp2::deferred_init<int*> p; 
+
+    auto a {1}; 
+    auto b {2}; 
+    auto c {3}; 
+    auto d {4}; 
+
+    if (cpp2::cmp_greater(args.argc,20)) {
+        c = 20;
+    } else if (cpp2::cmp_greater(args.argc,10)) {
+        c = 10;
+    }else {
+        if (args.argc % 2) {
+            b = 2;
+        }else {
+            b = 1;
+        }
+    }
+
+    if (args.argc==3) {
+        p.construct(&a);
+    } else if (cpp2::cmp_greater(b,2)) {
+        if (args.argc==2) {
+            p.construct(&c);
+        }else {
+            if (cpp2::cmp_greater(std::move(b),0)) {
+                p.construct(&a);
+            }
+            else {
+                p.construct(&d);
+            }
+        }
+    }else {
+        p.construct(&c);
+    }
+
+    std::cout << *cpp2::assert_not_null(std::move(p.value())) << std::endl;
+}
+

regression-tests/test-results/pure2-nested-ifs.cpp2.output

@@ -0,0 +1,2 @@
+pure2-nested-ifs.cpp2... ok (all Cpp2, passes safety checks)
+