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.

Sign up for GitHub

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

Jump to bottom

Fix misleading explanation of comma in $(),* #3800

Open
wants to merge 1 commit into
base: main
Choose a base branch
from
Open

Fix misleading explanation of comma in $(),* #3800

Changes from all commits
Commits
Show all changes
1 commit
Select commit
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
5 changes: 3 additions & 2 deletions src/ch19-06-macros.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -119,8 +119,9 @@ for use in the replacement code. Within `$()` is `$x:expr`, which matches any
Rust expression and gives the expression the name `$x`.

The comma following `$()` indicates that a literal comma separator character
could optionally appear after the code that matches the code in `$()`. The `*`
specifies that the pattern matches zero or more of whatever precedes the `*`.
must appear between each instance of the code that matches the code within
`$()`. The `*` specifies that the pattern matches zero or more of whatever
precedes the `*`.

When we call this macro with `vec![1, 2, 3];`, the `$x` pattern matches three
times with the three expressions `1`, `2`, and `3`.
Expand Down