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6.13.11 How to Handle Errors

Error handling is based on catch and throw. Errors are always thrown with a key and four arguments:

In addition to catch and throw, the following Scheme facilities are available:

Scheme Procedure: display-error frame port subr message args rest
C Function: scm_display_error (frame, port, subr, message, args, rest)

Display an error message to the output port port. frame is the frame in which the error occurred, subr is the name of the procedure in which the error occurred and message is the actual error message, which may contain formatting instructions. These will format the arguments in the list args accordingly. rest is currently ignored.

The following are the error keys defined by libguile and the situations in which they are used:


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