rust-lang/compiler-team

TypeVisitor: use ops::ControlFlow instead of bool

lcnr opened this issue · 2 comments

lcnr commented

Proposal

change the visit methods of TypeFoldable and TypeVisitor to use std::ops::ControlFlow<()> instead of bool. In the future we may change the used type to std::ops::ControlFlow<Self::BreakTy> but this is not part of this MCP for now. [ed: updated the type signatures post rust-lang/rust#76614]

This makes it more intuitive and means that we can stop adding comments like false // keep visiting, for example in https://github.com/rust-lang/rust/blob/9832374f6e378971e1a933362cf9781b121bb845/compiler/rustc_trait_selection/src/opaque_types.rs#L696.

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Process

The main points of the Major Change Process is as follows:

  • File an issue describing the proposal.
  • A compiler team member or contributor who is knowledgeable in the area can second by writing @rustbot second.
    • Finding a "second" suffices for internal changes. If however you are proposing a new public-facing feature, such as a -C flag, then full team check-off is required.
    • Compiler team members can initiate a check-off via @rfcbot fcp merge on either the MCP or the PR.
  • Once an MCP is seconded, the Final Comment Period begins. If no objections are raised after 10 days, the MCP is considered approved.

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Comments

This issue is not meant to be used for technical discussion. There is a Zulip stream for that. Use this issue to leave procedural comments, such as volunteering to review, indicating that you second the proposal (or third, etc), or raising a concern that you would like to be addressed.

rustbot commented

This issue is not meant to be used for technical discussion. There is a Zulip stream for that. Use this issue to leave procedural comments, such as volunteering to review, indicating that you second the proposal (or third, etc), or raising a concern that you would like to be addressed.