`cargo test` fails with:
```
$ cargo test master ✭
Compiling json_schema_test_suite_proc_macro v0.3.0 (/home/auke/projects/jsonschema-rs/jsonschema-test-suite/proc_macro)
Compiling jsonschema v0.17.1 (/home/auke/projects/jsonschema-rs/jsonschema)
error[E0432]: unresolved import `syn::ItemFn`
--> /home/auke/projects/jsonschema-rs/jsonschema-test-suite/proc_macro/src/lib.rs:41:37
|
41 | use syn::{parse_macro_input, Ident, ItemFn};
| ^^^^^^ no `ItemFn` in the root
|
note: found an item that was configured out
--> /home/auke/.cargo/registry/src/index.crates.io-6f17d22bba15001f/syn-1.0.109/src/lib.rs:365:32
|
365 | ItemEnum, ItemExternCrate, ItemFn, ItemForeignMod, ItemImpl, ItemMacro, ItemMacro2, ItemMod,
| ^^^^^^
= note: the item is gated behind the `full` feature
For more information about this error, try `rustc --explain E0432`.
```
This commit fixes the issue by applying the suggestion of the compiler.
Dmitry Dygalo
OrangeTux
Jacob Mischka
Dmitry Dygalo