feat: implement StringLiteral macro

string-literal/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "string-literal"
+version = "0.1.0"
+edition = "2024"
+license.workspace = true
+
+[features]
+macros = ["dep:string-literal-macros"]
+
+[dependencies]
+string-literal-macros = { optional = true, path = "../string-literal-macros" }

string-literal/src/lib.rs

@@ -0,0 +1,24 @@
+use std::fmt::{Debug, Display};
+
+#[cfg(feature = "macros")]
+pub use string_literal_macros::StringLiteral;
+
+#[derive(Debug, Clone)]
+pub struct WrongLiteralError<S> {
+    pub actual: String,
+    pub expected: S,
+}
+
+impl<S> Display for WrongLiteralError<S>
+where
+    S: AsRef<str>,
+{
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        let Self { actual, expected } = self;
+        let expected_str = expected.as_ref();
+
+        write!(f, "expected {expected_str:?} but got {actual:?}")
+    }
+}
+
+impl<S> std::error::Error for WrongLiteralError<S> where WrongLiteralError<S>: Debug + Display {}