⎕LER Line Error Report

The niladic system function ⎕LER returns a two-element numeric vector comprising the error code and line number of the last error that occurred. See the earlier chapter on Error Handling for a fuller discussion of ⎕LER and the pre-assigned Error Codes which it returns.

See also ⎕ERS (Error signalling) and ⎕ET (APL2-style error codes).