Revert "insert_returns"

This reverts commit 38a4970.

src/JSExpr.jl

@@ -91,10 +91,14 @@ function func_expr(args, body)
 end
 
 function insert_return(ex)
-  isexpr(ex, :block) ? :($(ex.args[1:end-1]...);$(insert_return(ex.args[end]))) :
-  isexpr(ex, :if) ? Expr(:if, ex.args[1], map(x -> insert_return(x), ex.args[2:end])...) :
-  isexpr(ex, :return) ? ex :
-  :(return $ex)
+    if isa(ex, Symbol) || !isexpr(ex, :block)
+        Expr(:return, ex)
+    else
+        isexpr(ex.args[end], :return) && return ex
+        ex1 = copy(ex)
+        ex1.args[end] = insert_return(ex.args[end])
+        ex1
+    end
 end