Errors

The procedure error raises the exception exn:user (which contains an error string). The error procedure has three forms:

• (error symbol) creates a message string by concatentaing "error: " with the string form of symbol.
• (error msg-string v ) creates a message string by concatenating msg-string with string versions of the vs (as produced by the current error value conversion handler; see section 9.4.1.9). A space is inserted before each v.
• (error src-symbol format-string v ) creates a message string equivalent to the string created by:

    (format (string-append "~s: " format-string) src-symbol v   ) 
  

In all cases, the constructed message string is passed to make-exn:user and the resulting exception is raised.

• Application Type Errors
• Syntax Errors
• Inferred Value Names