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Make EarlyBinder
's inner value private
#112006
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subst_identity i feel
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I would expect this to be
no_bound_vars()
🤔 though that may break with polymorphization rn?There was a problem hiding this comment.
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This type of pattern was always sketchy to me. Adding the EarlyBinder type makes it clear why.
I'm not sure how polymorphization works; seems like this could be a byproduct of it.
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Yeah, this panics with
no_bound_vars().unwrap()
unfortunately.From reading the polymorphization section in the rustc_dev_guide, it looks like polymorphization uses
ty::Param
to represent unused generics. So after polymorphizationsig
may appear toneeds_subst()
because of the presence ofty::Param
s. I'm sure it's more complicated than that in practice, but is that sort of the right way to think about this?Uh oh!
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yeah, it is exactly that, I want to move polymorphization to bound vars by changing instances to use
ty::Binder
and then using bound vars of params (as params are conceptionally just a different representation of bound vars or placeholders, depending on context 😁)I think using
ty::Param
for polymorphization will end up causing issues like the above in the future.Uh oh!
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that would be an option, I don't like it too much because
ty::Erased
should be equal to itself andfor<T, U> my_function<T, U>
should be different fromfor<T> my_function<T, T>
. While we may not necessarily end up with these cases in practice it still feels a bit dangerousThere was a problem hiding this comment.
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Both
for<T, U> my_function<T, U>
andfor<T> my_function<T, T>
should be equal to be able to codegen a single instance, right? Polymorphization already makes sure that it won't erase types that actually matter for codegen.There was a problem hiding this comment.
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yes, the issue is that if you polymorphize to bound vars, these two are different, but if you polymorphize to erased, then both end up as
my_function<erased, erased>
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You can't observe the difference at runtime, right? If you did, polymorphization should reject the candidates. Rustc passes
unnamed_addr
to LLVM, so just comparing the function pointers can return true already if after optimizations the function bodies are identical.Uh oh!
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for<T, U> my_function<T, U>
andfor<T> my_function<T, T>
probably won't happen in practice but you could imaginewe end up with
for<Eq, DontCare> check_type_ids<Eq, DontCare, Eq>
andfor<DontCare, Eq> check_type_ids<DontCare, Eq, Eq>
this isn't a great example which is why I said "While we may not necessarily end up with these cases in practice it still feels a bit dangerous". I am worried about having yet another global invariant which is difficult to sensibly check