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#lang br
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(require "struct.rkt")
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(provide b-line raise-line-error)
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(define-macro (b-line NUM STATEMENT ...)
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(with-pattern ([LINE-NUM (prefix-id "line-" #'NUM
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#:source #'NUM)])
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(syntax/loc caller-stx
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(define (LINE-NUM #:error [msg #f])
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(with-handlers
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([line-error?
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(λ (le) (handle-line-error NUM le))])
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(when msg (raise-line-error msg))
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STATEMENT ...)))))
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(define (raise-line-error error-msg)
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(raise (line-error error-msg)))
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(define (handle-line-error num le)
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(error (format "error in line ~a: ~a"
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num (line-error-msg le))))
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