(:refer-clojure :exclude [let]) breaks cider-repl-toggle-pretty-printing

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This is a bit of an edge case and I'm not sure if I should have opened it in the cider-nrepl issue tracker. I discovered this when writing a custom let macro and attempting to eval a macroexpand-1 hoping cider-repl-toggle-pretty-printing would save me some trouble.

Here's the message I get in the REPL:

CompilerException java.lang.RuntimeException: Unable to resolve symbol: let in this context, compiling:(/private/var/folders/sv/xytbwbxn6pg835_hkmyf8lxc0000gn/T/form-init8098409859872133519.clj:1:1) 

I'd be happy to help fix this if you could point me in the right direction.

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Thanks!