Error type for crate

Cargo.lock

@@ -5,3 +5,61 @@ version = 3
 [[package]]
 name = "chorus"
 version = "0.1.0"
+dependencies = [
+ "thiserror",
+]
+
+[[package]]
+name = "proc-macro2"
+version = "1.0.69"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "134c189feb4956b20f6f547d2cf727d4c0fe06722b20a0eec87ed445a97f92da"
+dependencies = [
+ "unicode-ident",
+]
+
+[[package]]
+name = "quote"
+version = "1.0.33"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5267fca4496028628a95160fc423a33e8b2e6af8a5302579e322e4b520293cae"
+dependencies = [
+ "proc-macro2",
+]
+
+[[package]]
+name = "syn"
+version = "2.0.38"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e96b79aaa137db8f61e26363a0c9b47d8b4ec75da28b7d1d614c2303e232408b"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
+[[package]]
+name = "thiserror"
+version = "1.0.50"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f9a7210f5c9a7156bb50aa36aed4c95afb51df0df00713949448cf9e97d382d2"
+dependencies = [
+ "thiserror-impl",
+]
+
+[[package]]
+name = "thiserror-impl"
+version = "1.0.50"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "266b2e40bc00e5a6c09c3584011e08b06f123c00362c92b975ba9843aaaa14b8"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "unicode-ident"
+version = "1.0.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3354b9ac3fae1ff6755cb6db53683adb661634f67557942dea4facebec0fee4b"

Cargo.toml

@@ -8,3 +8,4 @@ repository = "https://github.com/mikedilger/chorus"
 edition = "2021"
 
 [dependencies]
+thiserror = "1.0"

src/error.rs

@@ -0,0 +1,9 @@
+use thiserror::Error;
+
+/// Errors that can occur in the chorus crate
+#[derive(Error, Debug)]
+pub enum Error {
+    // I/O Error
+    #[error("I/O: {0}")]
+    Io(#[from] std::io::Error),
+}

src/main.rs

@@ -1,3 +1,9 @@
-fn main() {
-    println!("Hello, world!");
+pub mod error;
+
+use crate::error::Error;
+
+fn main() -> Result<(), Error> {
+    println!("No main yet.");
+
+    Ok(())
 }