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A developer can use the Code Issue extension, for instance, to write their own compiler warning and error messages. A sample project is included with the CTP that demonstrates this principle by displaying compiler warnings any time the letter A shows up in the syntax tree.
The Roslyn Compiler's Service APIs, which are registered with MEF, can be used to create Visual Studio extensions. By implementing specific interfaces and using MEF-style attributes that match, Visual Studio developers can take advantage of Roslyn.