[PATCH 15/40] gccrs: add ParamType::clone recusion guard

[Marc Poulhiès]

From: Philip Herron <herron.phi...@googlemail.com>

gcc/rust/ChangeLog:

        * typecheck/rust-tyty.cc (ParamType::clone): add guard

Signed-off-by: Philip Herron <herron.phi...@googlemail.com>

Tested on x86_64-pc-linux-gnu.

---
 gcc/rust/typecheck/rust-tyty.cc | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/gcc/rust/typecheck/rust-tyty.cc b/gcc/rust/typecheck/rust-tyty.cc
index 51adb831e4c..93061b1fcf6 100644
--- a/gcc/rust/typecheck/rust-tyty.cc
+++ b/gcc/rust/typecheck/rust-tyty.cc
@@ -3810,6 +3810,13 @@ ParamType::get_name () const
 BaseType *
 ParamType::clone () const
 {
+  static std::vector<HirId> active;
+  bool cycle = Resolver::ScopedPush<HirId>::contains (active, get_ty_ref ());
+  if (cycle)
+    return new ParamType (is_trait_self, get_symbol (), ident.locus, get_ref 
(),
+                         get_ty_ref (), {}, get_combined_refs ());
+
+  Resolver::ScopedPush<HirId> guard (active, get_ty_ref ());
   return new ParamType (is_trait_self, get_symbol (), ident.locus, get_ref (),
                        get_ty_ref (), get_specified_bounds (),
                        get_combined_refs ());
-- 
2.55.0