Make wasm::IString::operator bool() explicit (WebAssembly#5371)

higher-performance · web-flow · commit cec66beba456 · 2022-12-21T18:11:46.000Z
Fixes WebAssembly#5370
diff --git a/src/support/istring.h b/src/support/istring.h
@@ -67,7 +67,7 @@ struct IString {
 
   char operator[](int x) const { return str[x]; }
 
-  operator bool() const { return str.data() != nullptr; }
+  explicit operator bool() const { return str.data() != nullptr; }
 
   // TODO: deprecate?
   bool is() const { return bool(*this); }
