From 5745c830b2464c9d3761f6a55bbc5475fcbab8a6 Mon Sep 17 00:00:00 2001
From: Matthew Treinish <mtreinish@kortar.org>
Date: Thu, 2 Mar 2023 16:14:39 -0500
Subject: [PATCH] Use FnOnce for X type in circuit_psx_gen

---
 src/euler_one_qubit_decomposer.rs | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/src/euler_one_qubit_decomposer.rs b/src/euler_one_qubit_decomposer.rs
index 5051f38b375e..2dce29925918 100644
--- a/src/euler_one_qubit_decomposer.rs
+++ b/src/euler_one_qubit_decomposer.rs
@@ -289,7 +289,7 @@ fn circuit_psx_gen<F, P, X>(
 where
     F: FnMut(&mut OneQubitGateSequence),
     P: FnMut(&mut OneQubitGateSequence, f64),
-    X: FnMut(&mut OneQubitGateSequence),
+    X: FnOnce(&mut OneQubitGateSequence),
 {
     let mut phi = phi;
     let mut lam = lam;
@@ -338,7 +338,7 @@ where
     // emit circuit
     pfun(&mut circuit, lam);
     match xpifun {
-        Some(mut xpifun) if mod_2pi(theta).abs() < atol => xpifun(&mut circuit),
+        Some(xpifun) if mod_2pi(theta).abs() < atol => xpifun(&mut circuit),
         _ => {
             xfun(&mut circuit);
             pfun(&mut circuit, theta);
@@ -426,7 +426,7 @@ pub fn generate_circuit(
                 atol,
                 fnz,
                 fnx,
-                None::<Box<dyn FnMut(&mut OneQubitGateSequence)>>,
+                None::<Box<dyn FnOnce(&mut OneQubitGateSequence)>>,
             )
         }
         "ZSX" => {
@@ -456,7 +456,7 @@ pub fn generate_circuit(
                 atol,
                 fnz,
                 fnx,
-                None::<Box<dyn FnMut(&mut OneQubitGateSequence)>>,
+                None::<Box<dyn FnOnce(&mut OneQubitGateSequence)>>,
             )
         }
         "U1X" => {
@@ -486,7 +486,7 @@ pub fn generate_circuit(
                 atol,
                 fnz,
                 fnx,
-                None::<Box<dyn FnMut(&mut OneQubitGateSequence)>>,
+                None::<Box<dyn FnOnce(&mut OneQubitGateSequence)>>,
             )
         }
         "ZSXX" => {