Make line numbers worse for compatibilty

This is a simple fix for the tests, but a better solution is to make
Expr equivalence more permissive to accommodate having better line
information in the new parser!

src/expr.jl

@@ -384,8 +384,7 @@ function _internal_node_to_Expr(source, srcrange, head, childranges, childheads,
             if has_flags(head, SHORT_FORM_FUNCTION_FLAG)
                 a2 = args[2]
                 if !@isexpr(a2, :block)
-                    body_loc = source_location(LineNumberNode, source, first(childranges[2]))
-                    args[2] = Expr(:block, body_loc, a2)
+                    args[2] = Expr(:block, a2)
                 end
                 headsym = :(=)
             else

test/parser.jl

@@ -74,7 +74,9 @@ tests = [
         "f(x) .= 1"   =>  "(.= (call f x) 1)"
         "f(x) = 1"    =>  "(function-= (call f x) 1)"
         "f(x)::T = 1" =>  "(function-= (::-i (call f x) T) 1)"
+        "f(x) where S where U = 1" =>  "(function-= (where (where (call f x) S) U) 1)"
         "(f(x)::T) where S = 1" =>  "(function-= (where (parens (::-i (call f x) T)) S) 1)"
+        "f(x) = 1 = 2"    =>  "(function-= (call f x) (= 1 2))" # Should be a warning!
     ],
     JuliaSyntax.parse_pair => [
         "a => b"  =>  "(call-i a => b)"