chore: use variables in Rust format strings

Change this:

    format!("{}", foo)

into this:

    format!("{foo}")

Support for this feature was added in Rust 1.58 (see
https://github.com/rust-lang/rust/releases/tag/1.58.0) and in 1.67
clippy suggests about this. Because the new style seems to be where
the Rust ecosystem is going, I think Subplot should follow to avoid
being needlessly different from most other projects.

Sponsored-by: author

1 files changed, 1 insertions, 1 deletions

diff --git a/src/steps.rs b/src/steps.rs
index ccbc588..b0a15e9 100644
--- a/src/steps.rs
+++ b/src/steps.rs
@@ -109,7 +109,7 @@ impl fmt::Display for StepKind {
             StepKind::When => "when",
             StepKind::Then => "then",
         };
-        write!(f, "{}", s)
+        write!(f, "{s}")
     }
 }