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ice-9/read: Parse #{}}# properly.

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This is a regression since Guile 3.0.2 and breaks compilation
of a Guile library.

* module/ice-9/read.scm
  (%read)[read-parenthesized]: When SAW-BRACE? is #t but CH isn't
  #\#, don't eat CH.
* test-suite/tests/reader.test
  ("#{}#): Add four test cases.
This commit is contained in:
Maxime Devos 2021-07-18 19:59:32 +02:00 • committed by Daniel Llorens
parent d79a226359
commit c78c130b1d
2 changed files with 10 additions and 2 deletions
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7
module/ice-9/read.scm
View file

@ -556,12 +556,15 @@
(string->symbol
(list->string
(let lp ((saw-brace? #f))
(let ((ch (next-not-eof)))
(let lp/inner ((ch (next-not-eof))
(saw-brace? saw-brace?))
(cond
(saw-brace?
(if (eqv? ch #\#)
'()
(cons #\} (lp #f))))
;; Don't eat CH, see
;; <https://debbugs.gnu.org/cgi/bugreport.cgi?bug=49623>.
(cons #\} (lp/inner ch #f))))
((eqv? ch #\})
(lp #t))
((eqv? ch #\\)

5
test-suite/tests/reader.test
View file

@ -536,6 +536,11 @@
(with-test-prefix "#{}#"
(pass-if (equal? (read-string "#{}#") '#{}#))
;; See <https://debbugs.gnu.org/cgi/bugreport.cgi?bug=49623>
(pass-if (equal? (read-string "#{}}#") (string->symbol "}")))
(pass-if (equal? (read-string "#{}}}#") (string->symbol "}}")))
(pass-if (equal? (read-string "#{{}}#") (string->symbol "{}")))
(pass-if (equal? (read-string "#{{}b}#") (string->symbol "{}b")))
(pass-if (not (equal? (read-string "(a #{.}# b)") '(a . b))))
(pass-if (equal? (read-string "#{a}#") 'a))
(pass-if (equal? (read-string "#{a b}#") '#{a b}#))