import: crate: Fix incomplete lockfile parsing.

`guix import crate --lockfile=` silently drops every `[[package]]`
block after the first one whose dependencies list contains a source
in parentheses, e.g. `"foo 1.2.3 (registry+https://...)"`.

* guix/import/crate/cargo-lock.scm (dependency-specification): Parse
dependencies that specify the source in parentheses.

Assisted-by: LLM coding agents
Change-Id: I62099c5a538799ba7d4fded7b3f448df459e6bf2
Signed-off-by: Efraim Flashner <efraim@flashner.co.il>

1 files changed, 3 insertions, 1 deletions

diff --git a/guix/import/crate/cargo-lock.scm b/guix/import/crate/cargo-lock.scm
index b03050a244e..3709a64f6ce 100644
--- a/guix/import/crate/cargo-lock.scm
+++ b/guix/import/crate/cargo-lock.scm
@@ -81,7 +81,9 @@
 
 ;; dependency specification
 (define-peg-pattern dependency-specification all
-  (and crate-name (? (and (ignore " ") crate-version))))
+  (and crate-name
+       (? (and (ignore " ") crate-version))
+       (? (ignore (and " (" crate-source ")")))))
 
 ;; dependencies
 (define-peg-pattern crate-dependencies all