Value-initialize the result local in generated C++ tagged-enum constructors

src/bindgen/ir/enumeration.rs

@@ -1204,7 +1204,7 @@ impl Enum {
                 write!(out, ")");
                 out.open_brace();
 
-                write!(out, "{} result;", self.export_name);
+                write!(out, "{} result{{}};", self.export_name);
 
                 if let VariantBody::Body {
                     name: ref variant_name,

tests/expectations-symbols/tagged_enum_value_init.c.sym

@@ -0,0 +1,3 @@
+{
+root;
+};

tests/expectations/annotation.cpp

@@ -54,7 +54,7 @@ union F {
   Bar_Body bar;
 
   static F Foo(const int16_t &_0) {
-    F result;
+    F result{};
     ::new (&result.foo._0) (int16_t)(_0);
     result.tag = Tag::Foo;
     return result;
@@ -66,7 +66,7 @@ union F {
 
   static F Bar(const uint8_t &x,
                const int16_t &y) {
-    F result;
+    F result{};
     ::new (&result.bar.x) (uint8_t)(x);
     ::new (&result.bar.y) (int16_t)(y);
     result.tag = Tag::Bar;
@@ -78,7 +78,7 @@ union F {
   }
 
   static F Baz() {
-    F result;
+    F result{};
     result.tag = Tag::Baz;
     return result;
   }
@@ -111,7 +111,7 @@ struct H {
   };
 
   static H Hello(const int16_t &_0) {
-    H result;
+    H result{};
     ::new (&result.hello._0) (int16_t)(_0);
     result.tag = Tag::Hello;
     return result;
@@ -123,7 +123,7 @@ struct H {
 
   static H There(const uint8_t &x,
                  const int16_t &y) {
-    H result;
+    H result{};
     ::new (&result.there.x) (uint8_t)(x);
     ::new (&result.there.y) (int16_t)(y);
     result.tag = Tag::There;
@@ -135,7 +135,7 @@ struct H {
   }
 
   static H Everyone() {
-    H result;
+    H result{};
     result.tag = Tag::Everyone;
     return result;
   }

tests/expectations/array.cpp

@@ -19,7 +19,7 @@ struct Foo {
   };
 
   static Foo A(const float (&_0)[20]) {
-    Foo result;
+    Foo result{};
     for (int i = 0; i < 20; i++) {
       ::new (&result.a._0[i]) (float)(_0[i]);
     }

tests/expectations/asserted_cast.cpp

@@ -33,7 +33,7 @@ struct H {
   };
 
   static H H_Foo(const int16_t &_0) {
-    H result;
+    H result{};
     ::new (&result.foo._0) (int16_t)(_0);
     result.tag = Tag::H_Foo;
     return result;
@@ -55,7 +55,7 @@ struct H {
 
   static H H_Bar(const uint8_t &x,
                  const int16_t &y) {
-    H result;
+    H result{};
     ::new (&result.bar.x) (uint8_t)(x);
     ::new (&result.bar.y) (int16_t)(y);
     result.tag = Tag::H_Bar;
@@ -77,7 +77,7 @@ struct H {
   }
 
   static H H_Baz() {
-    H result;
+    H result{};
     result.tag = Tag::H_Baz;
     return result;
   }
@@ -110,7 +110,7 @@ struct J {
   };
 
   static J J_Foo(const int16_t &_0) {
-    J result;
+    J result{};
     ::new (&result.foo._0) (int16_t)(_0);
     result.tag = Tag::J_Foo;
     return result;
@@ -132,7 +132,7 @@ struct J {
 
   static J J_Bar(const uint8_t &x,
                  const int16_t &y) {
-    J result;
+    J result{};
     ::new (&result.bar.x) (uint8_t)(x);
     ::new (&result.bar.y) (int16_t)(y);
     result.tag = Tag::J_Bar;
@@ -154,7 +154,7 @@ struct J {
   }
 
   static J J_Baz() {
-    J result;
+    J result{};
     result.tag = Tag::J_Baz;
     return result;
   }
@@ -189,7 +189,7 @@ union K {
   K_Bar_Body bar;
 
   static K K_Foo(const int16_t &_0) {
-    K result;
+    K result{};
     ::new (&result.foo._0) (int16_t)(_0);
     result.tag = Tag::K_Foo;
     return result;
@@ -211,7 +211,7 @@ union K {
 
   static K K_Bar(const uint8_t &x,
                  const int16_t &y) {
-    K result;
+    K result{};
     ::new (&result.bar.x) (uint8_t)(x);
     ::new (&result.bar.y) (int16_t)(y);
     result.tag = Tag::K_Bar;
@@ -233,7 +233,7 @@ union K {
   }
 
   static K K_Baz() {
-    K result;
+    K result{};
     result.tag = Tag::K_Baz;
     return result;
   }

tests/expectations/cfg.cpp

@@ -147,7 +147,7 @@ union C {
 #endif
 
   static C C1() {
-    C result;
+    C result{};
     result.tag = Tag::C1;
     return result;
   }
@@ -157,7 +157,7 @@ union C {
   }
 
   static C C2() {
-    C result;
+    C result{};
     result.tag = Tag::C2;
     return result;
   }
@@ -168,7 +168,7 @@ union C {
 
 #if defined(PLATFORM_WIN)
   static C C3() {
-    C result;
+    C result{};
     result.tag = Tag::C3;
     return result;
   }
@@ -180,7 +180,7 @@ union C {
 
 #if defined(PLATFORM_UNIX)
   static C C5(const int32_t &int_) {
-    C result;
+    C result{};
     ::new (&result.c5.int_) (int32_t)(int_);
     result.tag = Tag::C5;
     return result;