[COMMITTED 14/83] gccrs: Fix ICE when its an optional return type

[arthur.cohen@opensrcsec.com]

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

Fixes Rust-GCC/gccrs#4814

gcc/rust/ChangeLog:

	* hir/rust-hir-dump.cc (Dump::do_typepathfunction): add guard

Signed-off-by: Philip Herron <herron.philip@googlemail.com>
---
 gcc/rust/hir/rust-hir-dump.cc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/gcc/rust/hir/rust-hir-dump.cc b/gcc/rust/hir/rust-hir-dump.cc
index f21522b4d48..e1c2cfa8e43 100644
--- a/gcc/rust/hir/rust-hir-dump.cc
+++ b/gcc/rust/hir/rust-hir-dump.cc
@@ -406,7 +406,8 @@ void
 Dump::do_typepathfunction (TypePathFunction &e)
 {
   visit_collection ("params", e.get_params ());
-  visit_field ("return_type", e.get_return_type ());
+  if (e.has_return_type ())
+    visit_field ("return_type", e.get_return_type ());
 }
 
 void
-- 
2.50.1