single-line comment contains line-continuation character
A single-line comment, which is introduced by //, contains a backslash (\) that serves as a line-continuation character. The compiler considers the next line to be a continuation and treats it as a comment.
Some syntax-directed editors do not indicate the line following the continuation character as a comment. Ignore syntax coloring on any lines that cause this warning.
The following sample generates C4010:
void main() { // the next line is also a comment because of the backslash int a = 3; a++; // C2065, a is undefined }