From db5a399d13b7fdafb7eaa7d299db777615ff0be2 Mon Sep 17 00:00:00 2001
From: Ryutaro Okada <1015ryu88@gmail.com>
Date: Sun, 30 Mar 2025 09:28:41 -0700
Subject: gccrs: Evaluate the enum's discriminant in a const context

gcc/rust/ChangeLog:

	* backend/rust-compile-resolve-path.cc: Evaluate the enum's discriminant in a const context

gcc/testsuite/ChangeLog:

	* rust/compile/enum_discriminant1.rs: New test.

Signed-off-by: Ryutaro Okada <1015ryu88@gmail.com>
---
 gcc/rust/backend/rust-compile-resolve-path.cc | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'gcc/rust')

diff --git a/gcc/rust/backend/rust-compile-resolve-path.cc b/gcc/rust/backend/rust-compile-resolve-path.cc
index 115dd04..3cb1eb6 100644
--- a/gcc/rust/backend/rust-compile-resolve-path.cc
+++ b/gcc/rust/backend/rust-compile-resolve-path.cc
@@ -105,7 +105,9 @@ ResolvePathRef::attempt_constructor_expression_lookup (
 
   // make the ctor for the union
   HIR::Expr &discrim_expr = variant->get_discriminant ();
+  ctx->push_const_context ();
   tree discrim_expr_node = CompileExpr::Compile (discrim_expr, ctx);
+  ctx->pop_const_context ();
   tree folded_discrim_expr = fold_expr (discrim_expr_node);
   tree qualifier = folded_discrim_expr;
 
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