gccrs: Lower AltPattern

gcc/rust/ChangeLog:

	* hir/rust-ast-lower-pattern.cc
	(ASTLoweringPattern::visit): Lower AltPattern.
	* hir/rust-ast-lower-pattern.h:
	(ASTLoweringPattern::visit): Add AltPattern visitor.

Signed-off-by: Owen Avery <powerboat9.gamer@gmail.com>

2 files changed, 21 insertions, 0 deletions

diff --git a/gcc/rust/hir/rust-ast-lower-pattern.cc b/gcc/rust/hir/rust-ast-lower-pattern.cc
index 0aef80c..2f2395d 100644
--- a/gcc/rust/hir/rust-ast-lower-pattern.cc
+++ b/gcc/rust/hir/rust-ast-lower-pattern.cc
@@ -297,5 +297,25 @@ ASTLoweringPattern::visit (AST::SlicePattern &pattern)
     = new HIR::SlicePattern (mapping, std::move (items), pattern.get_locus ());
 }
 
+void
+ASTLoweringPattern::visit (AST::AltPattern &pattern)
+{
+  auto crate_num = mappings->get_current_crate ();
+  Analysis::NodeMapping mapping (crate_num, pattern.get_node_id (),
+				 mappings->get_next_hir_id (crate_num),
+				 UNKNOWN_LOCAL_DEFID);
+
+  std::vector<std::unique_ptr<HIR::Pattern>> alts;
+
+  for (auto &alt : pattern.get_alts ())
+    {
+      alts.push_back (std::unique_ptr<HIR::Pattern> (
+	ASTLoweringPattern::translate (alt.get ())));
+    }
+
+  translated
+    = new HIR::AltPattern (mapping, std::move (alts), pattern.get_locus ());
+}
+
 } // namespace HIR
 } // namespace Rust
diff --git a/gcc/rust/hir/rust-ast-lower-pattern.h b/gcc/rust/hir/rust-ast-lower-pattern.h
index 4da644c..2b16e7a 100644
--- a/gcc/rust/hir/rust-ast-lower-pattern.h
+++ b/gcc/rust/hir/rust-ast-lower-pattern.h
@@ -42,6 +42,7 @@ public:
   void visit (AST::GroupedPattern &pattern) override;
   void visit (AST::ReferencePattern &pattern) override;
   void visit (AST::SlicePattern &pattern) override;
+  void visit (AST::AltPattern &pattern) override;
 
 private:
   ASTLoweringPattern ();