error (message [, level])
message
error
Usually, error
adds some information about the error position at the beginning of the message, if the message is a string. The level
argument specifies how to get the error position. With level 1 (the default), the error position is where the error
function was called. Level 2 points the error to where the function that called error
was called; and so on. Passing a level 0 avoids the addition of error position information to the message.
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