Can use .borrow_mut, but not .borrow, on Rc<RefCell<foo>>

help
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Playground: Rust Playground

Here I can borrow mutably from an Rc, which I don't need, but cannot borrow non-mutably. Puzzled as to why.

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It works if you remove the use std::borrow::Borrow; at the top. It's because the <Self as Borrow>::borrow() has higher precedence over the <Self as Deref>::Target::borrow() on the method lookup.

https://doc.rust-lang.org/reference/expressions/method-call-expr.html

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Ah. Non-obvious, but it works.

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