Avoid or_fun_call for const_fn with no args #5889
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☀️ Test successful - checks-action_dev_test, checks-action_remark_test, checks-action_test |
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This commit makes as many methods const as possible. Most involve the modification or introduction of zero-arg `new()` methods. This commit makes all error ZSTs only constructable via `T::new` instead of directly instantiating the struct inline by adding a `_private: ()` field. This change inverts the implementation of `T::default` and `T::new` so that `T::default` is implemented with `T::new`, allowing `T::new` to be const. All callsites have been updated to prefer calling `T::new`. It does not appear possible to construct byte slice literals in const fn. Suppress `clippy::or_fun_call` lint errors until rust-lang/rust-clippy#5889 is included in stable Rust. This commit reworks the implementation of `regexp::Options` to store a custom `RegexpOption` enum with `Enabled` and `Disabled` states instead of a `bool`. This eliminates a suppressed clippy lint and makes the code more readable. There are `From` implementations to and from `bool` as well as `RegexpOption::is_enabled`. Much of these functions can become const once const if match is stable. This commit also includes some readability improvements to extracting `RClass` pointers via `with_ffi_boundary`.
lopopolo
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Aug 18, 2020
This commit makes as many methods const as possible. Most involve the modification or introduction of zero-arg `new()` methods. This commit makes all error ZSTs only constructable via `T::new` instead of directly instantiating the struct inline by adding a `_private: ()` field. This change inverts the implementation of `T::default` and `T::new` so that `T::default` is implemented with `T::new`, allowing `T::new` to be const. All callsites have been updated to prefer calling `T::new`. It does not appear possible to construct byte slice literals in const fn. Suppress `clippy::or_fun_call` lint errors until rust-lang/rust-clippy#5889 is included in stable Rust. This commit reworks the implementation of `regexp::Options` to store a custom `RegexpOption` enum with `Enabled` and `Disabled` states instead of a `bool`. This eliminates a suppressed clippy lint and makes the code more readable. There are `From` implementations to and from `bool` as well as `RegexpOption::is_enabled`. Much of these functions can become const once const if match is stable. This commit also includes some readability improvements to extracting `RClass` pointers via `with_ffi_boundary`.
bors
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Revert: or_fun_call should lint calls to `const fn`s with no args The changes in #5889 and #5984 were done under the incorrect assumption that a `const fn` with no args was guaranteed to be evaluated at compile time. A `const fn` is only guaranteed to be evaluated at compile time if it's inside a const context (the initializer of a `const` or a `static`). See this [zulip conversation](https://rust-lang.zulipchat.com/#narrow/stream/122651-general/topic/Common.20misconception.3A.20.60const.20fn.60.20and.20its.20effect.20on.20codegen/near/208059113) for more details on this common misconception. Given that none of the linted methods by `or_fun_call` can be called in const contexts, the lint should make no exceptions. changelog: [`or_fun_call`] lints again calls to `const fn` with no args
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Based on #5682 by @lzutao
This avoids a subset of false positives, specifically those related to
const fns that take no arguments.For the rest, a much more involved fix would be needed, see #5682 (comment).
So this does not solve #5658
changelog: Avoid triggering [
or_fun_call] withconst fns that take no arguments.Fixes #5886