disable "local declared twice" error

This permits declaring a loop variable as local inside the loop,
which was used during 0.7 to get the new scope behavior.

src/julia-syntax.scm

@@ -2366,7 +2366,7 @@
 ;; pass 2: identify and rename local vars
 
 (define (check-dups locals others)
-  (if (pair? locals)
+  #;(if (pair? locals)
       (if (or (memq (car locals) (cdr locals)) (memq (car locals) others))
           (error (string "local \"" (car locals) "\" declared twice"))
           (check-dups (cdr locals) others)))

test/syntax.jl

@@ -521,7 +521,7 @@ end
               global x = 2
               local x = 1
               end")) == Expr(:error, "variable \"x\" declared both local and global")
-
+#=
 @test Meta.lower(Main, Meta.parse("let
               local x = 2
               local x = 1
@@ -534,7 +534,7 @@ end
 @test Meta.lower(Main, Meta.parse("let x = 2
                   local x = 1
               end")) == Expr(:error, "local \"x\" declared twice")
-
+=#
 # issue #23673
 @test :(let $([:(x=1),:(y=2)]...); x+y end) == :(let x = 1, y = 2; x+y end)