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I would like to create a new syntax highlighting files to colorize files with specific suffix (let's say .cext extenstion).

The .cext files are written with a syntax close to C++ but with some additional keywords and constructs.

Is there a way to create such new syntax highlighting without reinventing the wheel and by stating that the starting point is C++ syntax with some additional rules needed by the extensions used in .cext?

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The user manual explains how to do this at :help 44.9.

In your new cext.vim syntax highlighting file, add the following line to include the Vim runtime's existing C++ highlighting:

:runtime! syntax/cpp.vim

You can then add/adjust rules to meet your requirements.

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