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# https://github.com/prusa3d/PrusaSlicer/commit/4aa7366fafb7a3f91cc68d4a808f5195a4aa3dcf
diff --git a/src/libslic3r/MeshBoolean.cpp b/src/libslic3r/MeshBoolean.cpp
index d76bf468c7f..22232573953 100644
--- a/src/libslic3r/MeshBoolean.cpp
+++ b/src/libslic3r/MeshBoolean.cpp
@@ -152,12 +152,12 @@ indexed_triangle_set cgal_to_indexed_triangle_set(const _Mesh &cgalmesh)
const auto &vertices = cgalmesh.vertices();
int vsize = int(vertices.size());
- for (auto &vi : vertices) {
+ for (const auto &vi : vertices) {
auto &v = cgalmesh.point(vi); // Don't ask...
its.vertices.emplace_back(to_vec3f(v));
}
- for (auto &face : faces) {
+ for (const auto &face : faces) {
auto vtc = cgalmesh.vertices_around_face(cgalmesh.halfedge(face));
int i = 0;
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