Consistent error message

Signed-off-by: Rudi Grinberg <[email protected]>

Author: rgrinberg

src/jbuild.ml

@@ -844,7 +844,8 @@ module Library = struct
            if dune_version >= (1, 1) then
              name
            else
-             of_sexp_error loc "name field cannot be omitted before version 1.1"
+             of_sexp_error loc "name field cannot be omitted before version \
+                                1.1 of the dune language"
          | None, None ->
            of_sexp_error loc (
              if dune_version >= (1, 1) then

test/blackbox-tests/test-cases/no-name-field/run.t

@@ -5,7 +5,7 @@ the name field can be omitted for libraries when public_name is present
 this isn't possible for older syntax <= (1, 0)
   $ dune build --root no-name-lib-syntax-1-0
   File "dune", line 1, characters 0-27:
-  Error: name field cannot be omitted before version 1.1
+  Error: name field cannot be omitted before version 1.1 of the dune language
   [1]
 
 executable(s) stanza works the same way