impl IntoNode for Var

CHANGELOG.md

@@ -1,4 +1,6 @@
 # 0.3.2 (unreleased)
+- Added `impl IntoNode for Var`, to make handling `Var` values in a context
+  easier.
 
 # 0.3.1
 The highlight of this release is the `fidget::solver` module, which implements

fidget/src/core/var/mod.rs

@@ -5,6 +5,7 @@
 //! it is wrapped in a [`Op::Input`](crate::context::Op::Input)) to evaluation
 //! (where [`Tape::vars`](crate::eval::Tape::vars) maps from `Var` to index in
 //! the argument list).
+use crate::context::{Context, IntoNode, Node};
 use crate::Error;
 use serde::{Deserialize, Serialize};
 use std::collections::HashMap;
@@ -90,6 +91,12 @@ impl std::fmt::Display for Var {
     }
 }
 
+impl IntoNode for Var {
+    fn into_node(self, ctx: &mut Context) -> Result<Node, Error> {
+        Ok(ctx.var(self))
+    }
+}
+
 /// Map from [`Var`] to a particular index
 ///
 /// Variable indexes are automatically assigned the first time