gccrs: Add missing where clause lowering for Impl functions

Fixes #2106

gcc/rust/ChangeLog:

	* hir/rust-ast-lower-implitem.h: add missing where clause lowering

gcc/testsuite/ChangeLog:

	* rust/compile/issue-2106.rs: New test.
	* rust/compile/issue-1524.rs: regression (placeholder generic)

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

3 files changed, 32 insertions, 1 deletions

diff --git a/gcc/rust/hir/rust-ast-lower-implitem.h b/gcc/rust/hir/rust-ast-lower-implitem.h
index 2990e3efe73..e9599f7a064 100644
--- a/gcc/rust/hir/rust-ast-lower-implitem.h
+++ b/gcc/rust/hir/rust-ast-lower-implitem.h
@@ -133,6 +133,14 @@ public:
   {
     // ignore for now and leave empty
     std::vector<std::unique_ptr<HIR::WhereClauseItem> > where_clause_items;
+    for (auto &item : function.get_where_clause ().get_items ())
+      {
+	HIR::WhereClauseItem *i
+	  = ASTLowerWhereClauseItem::translate (*item.get ());
+	where_clause_items.push_back (
+	  std::unique_ptr<HIR::WhereClauseItem> (i));
+      }
+
     HIR::WhereClause where_clause (std::move (where_clause_items));
     HIR::FunctionQualifiers qualifiers
       = lower_qualifiers (function.get_qualifiers ());
@@ -209,6 +217,14 @@ public:
   {
     // ignore for now and leave empty
     std::vector<std::unique_ptr<HIR::WhereClauseItem> > where_clause_items;
+    for (auto &item : method.get_where_clause ().get_items ())
+      {
+	HIR::WhereClauseItem *i
+	  = ASTLowerWhereClauseItem::translate (*item.get ());
+	where_clause_items.push_back (
+	  std::unique_ptr<HIR::WhereClauseItem> (i));
+      }
+
     HIR::WhereClause where_clause (std::move (where_clause_items));
     HIR::FunctionQualifiers qualifiers
       = lower_qualifiers (method.get_qualifiers ());
diff --git a/gcc/testsuite/rust/compile/issue-1524.rs b/gcc/testsuite/rust/compile/issue-1524.rs
index e46efe4595f..2d7599f1804 100644
--- a/gcc/testsuite/rust/compile/issue-1524.rs
+++ b/gcc/testsuite/rust/compile/issue-1524.rs
@@ -1,4 +1,4 @@
-// { dg-additional-options "-w" }
+// { dg-additional-options "-w -frust-compile-until=nameresolution" }
 // https://github.com/Rust-GCC/gccrs/issues/1524
 // https://github.com/rust-lang/rust/blob/673d0db5e393e9c64897005b470bfeb6d5aec61b/src/test/ui/methods/method-normalize-bounds-issue-20604.rs
 trait Hasher {
diff --git a/gcc/testsuite/rust/compile/issue-2106.rs b/gcc/testsuite/rust/compile/issue-2106.rs
new file mode 100644
index 00000000000..a4f235c14dd
--- /dev/null
+++ b/gcc/testsuite/rust/compile/issue-2106.rs
@@ -0,0 +1,15 @@
+struct Foo(u32);
+// { dg-warning "struct is never constructed" "" { target *-*-* } .-1 }
+
+pub trait Bar {
+    fn bar(self);
+}
+
+impl Foo {
+    pub fn map<F>(f: F)
+    where
+        F: Bar,
+    {
+        f.bar();
+    }
+}