Update macro rules to account for 1.32.0 changes #32
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
https://blog.rust-lang.org/2019/01/17/Rust-1.32.0.html
Macro improvements
A few improvements to macros have landed in Rust 1.32.0. First, a new
literal
matcher was added:literal
matches against literals of any type; string literals, numeric literals,char
literals.In the 2018 edition,
macro_rules
macros can also use?
, like this:The
?
will match zero or one repetitions of the pattern, similar to the already-existing*
for "zero or more" and+
for "one or more."