Fix trivia diagnostic range in empty mulitdimensional array syntax + add tests

Author: c42f

src/parser.jl

@@ -2727,11 +2727,13 @@ function parse_cat(ps::ParseState, closer, end_is_symbol)
         # []  ==>  (vect)
         return parse_vect(ps, closer)
     elseif k == K";"
+        #v1.8: [;]           ==>  (ncat-1)
         #v1.8: [;;]          ==>  (ncat-2)
         #v1.8: [\n  ;; \n ]  ==>  (ncat-2)
+        #v1.7: [;;]          ==>  (ncat-2 (error))
         n_semis, _ = parse_array_separator(ps; skip_newlines=true)
-        bump_closing_token(ps, closer)
         min_supported_version(v"1.8", ps, mark, "empty multidimensional array syntax")
+        bump_closing_token(ps, closer)
         return (K"ncat", set_numeric_flags(n_semis))
     end
     parse_eq_star(ps)

test/parser.jl

@@ -634,8 +634,10 @@ tests = [
         ((v=v"1.7",), "[x ; y ;; z ; w ;;; a ; b ;; c ; d]")  =>
             "(ncat-3 (nrow-2 (nrow-1 x y) (nrow-1 z w)) (nrow-2 (nrow-1 a b) (nrow-1 c d)))"
         # Empty nd arrays
+        ((v=v"1.8",), "[;]")   =>  "(ncat-1)"
         ((v=v"1.8",), "[;;]")  =>  "(ncat-2)"
         ((v=v"1.8",), "[\n  ;; \n ]")  =>  "(ncat-2)"
+        ((v=v"1.7",), "[;;]")  =>  "(ncat-2 (error))"
     ],
     JuliaSyntax.parse_string => [
         "\"a \$(x + y) b\""  =>  "(string \"a \" (call-i x + y) \" b\")"