Move trybuild tests and remove usage crate (#13)

The usage crate was mostly used as a home for the try-build tests. We can move these and eliminate the unneeded crate.

Author: schneems

Cargo.lock

@@ -1,7 +1,6 @@
 [workspace]
 resolver = "2"
 members = [
-    "usage",
     "cache_diff",
     "cache_diff_derive",
 ]
@@ -15,6 +14,6 @@ repository = "https://github.com/heroku-buildpacks/cache_diff"
 documentation = "https://docs.rs/cache_diff"
 
 [workspace.dependencies]
-pretty_assertions = "1.4.1"
-indoc = "2"
-serde = {version = "1.0", features = ["derive"] }
+pretty_assertions = "1.4"
+indoc = "2.0"
+serde = { version = "1.0", features = ["derive"] }

Cargo.toml

@@ -19,3 +19,7 @@ derive = ["dep:cache_diff_derive"]
 
 # Formats values with `bullet_stream::style::value` which includes ANSI colors
 bullet_stream = ["derive", "dep:bullet_stream"]
+
+[dev-dependencies]
+trybuild = "1.0"
+serde.workspace = true

cache_diff/Cargo.toml

@@ -259,11 +259,11 @@ $ cargo install cargo-release
 Release readiness for all crates can be checked by running:
 
 ```
-$ cargo release --workspace --exclude usage --dry-run
+$ cargo release --workspace --dry-run
 ```
 
 When satisfied, contributors with permissions can release by running:
 
 ```
-$ cargo release --workspace --exclude usage --execute
+$ cargo release --workspace --execute
 ```

cache_diff/README.md

@@ -19,7 +19,7 @@ error[E0277]: `T` doesn't implement `std::fmt::Display`
   = note: in format strings you may be able to use `{:?}` (or {:#?} for pretty-print) instead
   = note: required for `&T` to implement `std::fmt::Display`
 note: required by a bound in `fmt_value`
- --> $WORKSPACE/cache_diff/src/lib.rs
+ --> src/lib.rs
   |
   |     fn fmt_value<T: std::fmt::Display>(&self, value: &T) -> String {
   |                     ^^^^^^^^^^^^^^^^^ required by this bound in `CacheDiff::fmt_value`