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add a note on tcx name

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mark 2020-04-04 13:04:36 -05:00 committed by Who? Me?!
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@ -222,7 +222,10 @@ LLVM-IR are query-fied. That is, lexing and parsing are done all at once for
the whole program. the whole program.
One other thing to mention here is the all-important "typing context", One other thing to mention here is the all-important "typing context",
[`TyCtxt`], which is a giant struct that is at the center of all things. All [`TyCtxt`], which is a giant struct that is at the center of all things.
(Note that the name is mostly historic. This is _not_ a "typing context" in the
sense of `Γ` or `Δ` from type theory. The name is retained because that's what
the name of the struct is in the source code.) All
queries are defined as methods on the [`TyCtxt`] type, and the in-memory query queries are defined as methods on the [`TyCtxt`] type, and the in-memory query
cache is stored there too. In the code, there is usually a variable called cache is stored there too. In the code, there is usually a variable called
`tcx` which is a handle on the typing context. You will also see lifetimes with `tcx` which is a handle on the typing context. You will also see lifetimes with