gccrs: Fix ICE on raw reference

This patch adds support for raw references which enforce the pointer
type away from a reference type.

Fixes Rust-GCC#3667

gcc/rust/ChangeLog:

	* backend/rust-compile-base.cc (HIRCompileBase::address_expression): allow optional type
	* backend/rust-compile-base.h: update prototype
	* backend/rust-compile-expr.cc (CompileExpr::visit): update borrow expr
	* backend/rust-compile-extern.h: remove unused debug
	* backend/rust-compile-resolve-path.cc (HIRCompileBase::query_compile): update usage
	* hir/rust-ast-lower-expr.cc (ASTLoweringExpr::visit): lower raw ref
	* hir/tree/rust-hir-expr.cc (BorrowExpr::BorrowExpr): add flag for raw ref
	* hir/tree/rust-hir-expr.h (class BorrowExpr): add new raw ref field
	* typecheck/rust-hir-type-check-expr.cc (TypeCheckExpr::visit): add handle for raw ref

gcc/testsuite/ChangeLog:

	* rust/compile/issue-3667.rs: New test.

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

1 files changed, 5 insertions, 2 deletions

diff --git a/gcc/rust/backend/rust-compile-base.cc b/gcc/rust/backend/rust-compile-base.cc
index b6bee8f..0647718 100644
--- a/gcc/rust/backend/rust-compile-base.cc
+++ b/gcc/rust/backend/rust-compile-base.cc
@@ -549,7 +549,7 @@ HIRCompileBase::mark_addressable (tree exp, location_t locus)
 }
 
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-HIRCompileBase::address_expression (tree expr, location_t location)
+HIRCompileBase::address_expression (tree expr, location_t location, tree ptrty)
 {
   if (expr == error_mark_node)
     return error_mark_node;
@@ -557,7 +557,10 @@ HIRCompileBase::address_expression (tree expr, location_t location)
   if (!mark_addressable (expr, location))
     return error_mark_node;
 
-  return build_fold_addr_expr_loc (location, expr);
+  if (ptrty == NULL || ptrty == error_mark_node)
+    ptrty = build_pointer_type (TREE_TYPE (expr));
+
+  return build_fold_addr_expr_with_type_loc (location, expr, ptrty);
 }
 
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