From: Philip Herron <[email protected]>

Fixes Rust-GCC#1617

gcc/rust/ChangeLog:

        * typecheck/rust-hir-type-check-item.cc (TypeCheckItem::visit): check 
valid

gcc/testsuite/ChangeLog:

        * rust/compile/issue-4617.rs: New test.

Signed-off-by: Philip Herron <[email protected]>
---
This change was merged into the gccrs repository and is posted here for
upstream visibility and potential drive-by review, as requested by GCC
release managers.
Each commit email contains a link to its details on github from where you can
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Commit on github: 
https://github.com/Rust-GCC/gccrs/commit/206d052f0c25feb613d28fcd71877db7db089c14

The commit has NOT been mentioned in any issue.

The commit has been mentioned in the following pull-request(s):
 - https://github.com/Rust-GCC/gccrs/pull/4661

 gcc/rust/typecheck/rust-hir-type-check-item.cc | 8 +++++---
 gcc/testsuite/rust/compile/issue-4617.rs       | 8 ++++++++
 2 files changed, 13 insertions(+), 3 deletions(-)
 create mode 100644 gcc/testsuite/rust/compile/issue-4617.rs

diff --git a/gcc/rust/typecheck/rust-hir-type-check-item.cc 
b/gcc/rust/typecheck/rust-hir-type-check-item.cc
index 055ce2b28..065615a23 100644
--- a/gcc/rust/typecheck/rust-hir-type-check-item.cc
+++ b/gcc/rust/typecheck/rust-hir-type-check-item.cc
@@ -421,9 +421,11 @@ TypeCheckItem::visit (HIR::Enum &enum_decl)
     {
       TyTy::VariantDef *field_type
        = TypeCheckEnumItem::Resolve (*variant, discriminant_value);
-
-      discriminant_value++;
-      variants.push_back (field_type);
+      if (field_type)
+       {
+         discriminant_value++;
+         variants.push_back (field_type);
+       }
     }
 
   // Check for zero-variant enum compatibility
diff --git a/gcc/testsuite/rust/compile/issue-4617.rs 
b/gcc/testsuite/rust/compile/issue-4617.rs
new file mode 100644
index 000000000..202310071
--- /dev/null
+++ b/gcc/testsuite/rust/compile/issue-4617.rs
@@ -0,0 +1,8 @@
+#![feature(no_core)]
+#![no_core]
+
+struct Apple;
+
+enum Delicious {
+    ApplePie = Apple::PIE, // { dg-error "failed to resolve path segment using 
an impl Probe" }
+}

base-commit: 407b7e6c52619bb81e201293a52819bbe22d9c8e
-- 
2.54.0

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