add depwarn for using .+ etc as function objects

base/deprecated.jl

@@ -1000,4 +1000,18 @@ macro vectorize_2arg(S,f)
 end
 export @vectorize_1arg, @vectorize_2arg
 
+# deprecations for uses of old dot operators (.* etc) as objects, rather than
+# just calling them infix.
+for op in (:(!=), :≠, :+, :-, :*, :/, :÷, :%, :<, :(<=), :≤, :(==), :>, :>=, :≥, :\, :^)
+    dotop = Symbol(string('.', op))
+    # define as const dotop = (a,b) -> ...
+    # to work around syntax deprecation for dotop(a,b) = ...
+    @eval const $dotop = (a,b) -> begin
+        depwarn(string($(string(dotop)), " is no longer a function object; use broadcast(",$op,", ...) instead"),
+                $(QuoteNode(dotop)))
+        broadcast($op, a, b)
+    end
+    @eval export $dotop
+end
+
 # End deprecations scheduled for 0.6