Compiler Warning (level 4) C4431
This error can be generated as a result of compiler conformance work that was done for Visual C++ 2005: Visual C++ no longer creates untyped identifiers as int by default. The type of an identifier must be specified explicitly. See Breaking Changes in the Visual C++ 2005 Compiler for more information.
This warning is off by default. See Compiler Warnings That Are Off by Default for more information.