1 files changed, 27 insertions, 0 deletions
diff --git a/src/from_generics.rs b/src/from_generics.rs
new file mode 100644
index 0000000..8f68710
--- /dev/null
+++ b/src/from_generics.rs
@@ -0,0 +1,27 @@
+use syn::Generics;
+
+use crate::Result;
+
+/// Creates an instance by parsing an entire generics declaration, including the
+/// `where` clause.
+pub trait FromGenerics: Sized {
+    fn from_generics(generics: &Generics) -> Result<Self>;
+}
+
+impl FromGenerics for () {
+    fn from_generics(_generics: &Generics) -> Result<Self> {
+        Ok(())
+    }
+}
+
+impl FromGenerics for Generics {
+    fn from_generics(generics: &Generics) -> Result<Self> {
+        Ok(generics.clone())
+    }
+}
+
+impl<T: FromGenerics> FromGenerics for Result<T> {
+    fn from_generics(generics: &Generics) -> Result<Self> {
+        Ok(FromGenerics::from_generics(generics))
+    }
+}