lint: Report synopses/descriptions that are not strings.

Suggested by John Darrington.

* guix/scripts/lint.scm (check-description-style): Emit a warning when
DESCRIPTION is not a string.
(check-synopsis-style): Likewise.
(check-gnu-synopsis+description): Likewise.
* tests/lint.scm ("description: not a string", "synopsis: not a
string"): New tests.

1 files changed, 16 insertions, 0 deletions

diff --git a/tests/lint.scm b/tests/lint.scm
index 4f0196491d2..9bc42990ef1 100644
--- a/tests/lint.scm
+++ b/tests/lint.scm
@@ -138,6 +138,14 @@ requests."
 (define-syntax-rule (with-warnings body ...)
   (call-with-warnings (lambda () body ...)))
 
+(test-assert "description: not a string"
+  (->bool
+   (string-contains (with-warnings
+                      (let ((pkg (dummy-package "x"
+                                   (description 'foobar))))
+                        (check-description-style pkg)))
+                    "invalid description")))
+
 (test-assert "description: not empty"
   (->bool
    (string-contains (with-warnings
@@ -191,6 +199,14 @@ requests."
                    "E.g. Foo, i.e. Bar resp. Baz (a.k.a. DVD)."))))
        (check-description-style pkg)))))
 
+(test-assert "synopsis: not a string"
+  (->bool
+   (string-contains (with-warnings
+                      (let ((pkg (dummy-package "x"
+                                   (synopsis #f))))
+                        (check-synopsis-style pkg)))
+                    "invalid synopsis")))
+
 (test-assert "synopsis: not empty"
   (->bool
    (string-contains (with-warnings