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Provides an abstraction for what to do with error messages.

Source errorsink.d

abstract class ErrorSink;
Where error/warning/deprecation messages go.
class ErrorSinkNull: dmd.errorsink.ErrorSink;
Just ignores the messages.
class ErrorSinkLatch: dmd.errorsink.ErrorSinkNull;
Ignores the messages, but sets sawErrors for any calls to error()
class ErrorSinkStderr: dmd.errorsink.ErrorSink;
Simplest implementation, just sends messages to stderr. See also: ErrorSinkCompiler.