initial working code

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Cargo.toml

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+[package]
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+version = "0.1.0"
+edition = "2021"
+authors = ["conduition <conduition@proton.me>"]
+description = "Ticketed Discreet Log Contracts"
+readme = "README.md"
+license = "Unlicense"
+repository = "https://github.com/conduition/ticketed-dlc"
+keywords = ["dlc", "smart", "contract", "ticket", "auction"]
+
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+secp256k1 = { version = "0.28.2", features = ["global-context"] }
+sha2 = "0.10.8"
+
+[package.metadata.docs.rs]
+all-features = true

src/errors.rs

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+/// TODO actual error types.
+#[derive(Debug, Clone)]
+pub struct Error;
+
+impl std::fmt::Display for Error {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        f.write_str("generic error")
+    }
+}
+
+impl std::error::Error for Error {}
+
+impl From<musig2::errors::KeyAggError> for Error {
+    fn from(_: musig2::errors::KeyAggError) -> Self {
+        Error
+    }
+}
+
+impl From<musig2::errors::TweakError> for Error {
+    fn from(_: musig2::errors::TweakError) -> Self {
+        Error
+    }
+}
+
+impl From<bitcoin::taproot::TaprootBuilderError> for Error {
+    fn from(_: bitcoin::taproot::TaprootBuilderError) -> Self {
+        Error
+    }
+}
+
+impl From<bitcoin::taproot::IncompleteBuilderError> for Error {
+    fn from(_: bitcoin::taproot::IncompleteBuilderError) -> Self {
+        Error
+    }
+}