Loss of location in (library) code

[manday]

As discussed on #guile, we tried for a "possibly unbound variable" warning, on 
Guile 3.0.4:

When the offending form is somewhere in a RnRS module or Guile library, the 
warnings give inconsistent line numbers. For instance:

(library (test)
 (export f)
 (import (rnrs))
 (define (f x)
  (if x
   (cons x 3)
   (IS-UNBOUND x))))

produces "4:1: warning: possibly unbound variable `IS-UNBOUND'", the warning is 
located on the (define) whereas

; Line 1
; Line 2
; Line 3
(define (f x)
 (if x
  (cons x 3)
  (IS-UNBOUND x)))

produces "7:2: warning: possibly unbound variable `IS-UNBOUND'", the warning is 
located correctly.

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