fix #24962, bad syntax error for {V) (#25839)

Author: JeffBezanson

src/julia-parser.scm

@@ -1846,7 +1846,9 @@
                  (error "invalid comprehension syntax")))
             (else
              (if (and (pair? vec) (not (ts:space? s)))
-                 (error (string "expected separator between arguments to \"[ ]\"; got \""
+                 (error (string "expected \"" closer "\" or separator in arguments to \""
+                                (if (eqv? closer #\]) #\[ #\{) " " closer
+                                "\"; got \""
                                 (deparse (car vec)) t "\"")))
              (loop (cons (parse-eq* s) vec) outer))))))))
 

test/syntax.jl

@@ -1239,6 +1239,9 @@ end
     @test raw"x \\\ y" == "x \\\\\\ y"
 end
 
+@test_throws ParseError("expected \"}\" or separator in arguments to \"{ }\"; got \"V)\"") Meta.parse("f(x::V) where {V) = x")
+@test_throws ParseError("expected \"]\" or separator in arguments to \"[ ]\"; got \"1)\"") Meta.parse("[1)")
+
 # issue #9972
 @test Meta.lower(@__MODULE__, :(f(;3))) == Expr(:error, "invalid keyword argument syntax \"3\"")