Fixes infinite loop

src/prover/tracing.rs

@@ -0,0 +1,55 @@
+use std::fmt::Display;
+
+use log::info;
+
+#[derive(Clone, Copy)]
+pub enum ProofType
+{
+    Body,
+    And,
+    Predicate,
+}
+
+impl Display for ProofType
+{
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result
+    {
+        match self
+        {
+            ProofType::Body => write!(f, "body_prover"),
+            ProofType::And => write!(f, "and_prover"),
+            ProofType::Predicate => write!(f, "predicate_prover"),
+        }
+    }
+}
+
+pub trait Tracer
+{
+    fn next_step(&mut self, proof_type: ProofType) -> Self;
+    fn milestone<T: Display>(&self, str: T);
+    fn explain<T: Display>(&self, str: T);
+}
+
+pub struct SimpleTracer
+{
+    proof_type: ProofType,
+}
+
+impl Tracer for SimpleTracer
+{
+    fn next_step(&mut self, proof_type: ProofType) -> Self
+    {
+        SimpleTracer { proof_type }
+    }
+
+    fn explain<T: Display>(&self, str: T)
+    {
+        let proof_str = format!("{}", self.proof_type);
+        info!(target: &proof_str, "{}", str);
+    }
+
+    fn milestone<T: Display>(&self, str: T)
+    {
+        self.explain(str);
+    }
+}