mycobol extending vscode_cobol

This is an example extension that extends the vscode cobol extension in order provide some custom syntax for:

• $IF TOTEMX DEFINED
• $IF XLSCX DEFINED
• $END

and a comment line that starts with |

For example:

You may use it as a start to create your own one, for example to add syntax-support for an own COBOL preparser you use.