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`AssocOp::AssignOp` contains a `BinOpToken`. `ExprKind::AssignOp` contains a `BinOpKind`. Given that `AssocOp` is basically a cut-down version of `ExprKind`, it makes sense to make `AssocOp` more like `ExprKind`. Especially given that `AssocOp` and `BinOpKind` use semantic operation names (e.g. `Mul`, `Div`), but `BinOpToken` uses syntactic names (e.g. `Star`, `Slash`). This results in more concise code, and removes the need for various conversions. (Note that the removed functions `hirbinop2assignop` and `astbinop2assignop` are semantically identical, because `hir::BinOp` is just a synonum for `ast::BinOp`!) The only downside to this is that it allows the possibility of some nonsensical combinations, such as `AssocOp::AssignOp(BinOpKind::Lt)`. But `ExprKind::AssignOp` already has that problem. The problem can be fixed for both types in the future with some effort, by introducing an `AssignOpKind` type. |
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The rustc_ast crate contains those things concerned purely with syntax
– that is, the AST ("abstract syntax tree"), along with some definitions for tokens and token streams, data structures/traits for mutating ASTs, and shared definitions for other AST-related parts of the compiler (like the lexer and macro-expansion).
For more information about how these things work in rustc, see the rustc dev guide: