Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Add WF to glossary #1810

Merged
merged 1 commit into from
Oct 22, 2023
Merged
Changes from all commits
Commits
File filter

Filter by extension

Filter by extension

Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
1 change: 1 addition & 0 deletions src/appendix/glossary.md
Original file line number Diff line number Diff line change
Expand Up @@ -94,6 +94,7 @@ Term | Meaning
<span id="upvar">upvar</span> &nbsp; | A variable captured by a closure from outside the closure.
<span id="variance">variance</span> &nbsp; | Determines how changes to a generic type/lifetime parameter affect subtyping; for example, if `T` is a subtype of `U`, then `Vec<T>` is a subtype `Vec<U>` because `Vec` is *covariant* in its generic parameter. See [the background chapter](./background.md#variance) for a more general explanation. See the [variance chapter](../variance.md) for an explanation of how type checking handles variance.
<span id="variant-idx">variant index</span> &nbsp; | In an enum, identifies a variant by assigning them indices starting at 0. This is purely internal and not to be confused with the ["discriminant"](#discriminant) which can be overwritten by the user (e.g. `enum Bool { True = 42, False = 0 }`).
<span id="WF">Well-formedness</span> &nbsp; | Semantically:An expression that evaluates to meaningful result. In Type Systems: A type related construct which follows rules of the type system.
<span id="wide-ptr">wide pointer</span> &nbsp; | A pointer with additional metadata. See "fat pointer" for more.
<span id="zst">ZST</span> &nbsp; | Zero-Sized Type. A type whose values have size 0 bytes. Since `2^0 = 1`, such types can have exactly one value. For example, `()` (unit) is a ZST. `struct Foo;` is also a ZST. The compiler can do some nice optimizations around ZSTs.

Expand Down