Logging functions (Lepton EDA Scheme Reference Manual 1.9.18)

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### 2.6 Logging functions

To use the functions described in this section, you will need to load the `(lepton log)` module.

Function: log! level message [format-args...] ¶

  Emit a log message with the specified level. The message is interpreted as a format string, with format-args as its parameters.

  The level should be one of the symbols `error`, `critical`, `warning`, `message`, `info` or `debug`.

  Note: if level is set to `error`, main program will terminate.

  Generally, if the level is not `debug`, then the message should be localised.