[gcc/devel/rust/master] gccrs: Add missing Sized, Copy and Clone lang item mappings

[Thomas Schwinge <tschwinge@gcc.gnu.org>]

https://gcc.gnu.org/g:d4e6b64e7f9e23aeb5d3c40665f18091575921ed

commit d4e6b64e7f9e23aeb5d3c40665f18091575921ed
Author: Philip Herron <herron.philip@googlemail.com>
Date:   Tue Jan 31 14:39:29 2023 +0000

    gccrs: Add missing Sized, Copy and Clone lang item mappings
    
    We need these lang items to be defined and later down the line the mappings
    will be used to implement proper copy and clone logic.
    
    Fixes #1786
    
    Signed-off-by: Philip Herron <herron.philip@googlemail.com>
    
    gcc/rust/ChangeLog:
    
            * util/rust-lang-item.h:
    
    gcc/testsuite/ChangeLog:
    
            * rust/compile/issue-1786.rs: New test.

Diff:
---
 gcc/rust/util/rust-lang-item.h           | 24 ++++++++++++++++++++++++
 gcc/testsuite/rust/compile/issue-1786.rs | 23 +++++++++++++++++++++++
 2 files changed, 47 insertions(+)

diff --git a/gcc/rust/util/rust-lang-item.h b/gcc/rust/util/rust-lang-item.h
index 52f53fa3f93..5bad08ae7c1 100644
--- a/gcc/rust/util/rust-lang-item.h
+++ b/gcc/rust/util/rust-lang-item.h
@@ -80,6 +80,12 @@ public:
     FN_ONCE,
     FN_ONCE_OUTPUT,
 
+    // markers
+    COPY,
+    CLONE,
+    SIZED,
+
+    // delimiter
     UNKNOWN,
   };
 
@@ -237,6 +243,18 @@ public:
       {
 	return ItemType::FN_ONCE_OUTPUT;
       }
+    else if (item.compare ("copy") == 0)
+      {
+	return ItemType::COPY;
+      }
+    else if (item.compare ("clone") == 0)
+      {
+	return ItemType::CLONE;
+      }
+    else if (item.compare ("sized") == 0)
+      {
+	return ItemType::SIZED;
+      }
 
     return ItemType::UNKNOWN;
   }
@@ -321,6 +339,12 @@ public:
 	return "fn_once";
       case FN_ONCE_OUTPUT:
 	return "fn_once_output";
+      case COPY:
+	return "copy";
+      case CLONE:
+	return "clone";
+      case SIZED:
+	return "sized";
 
       case UNKNOWN:
 	return "<UNKNOWN>";
diff --git a/gcc/testsuite/rust/compile/issue-1786.rs b/gcc/testsuite/rust/compile/issue-1786.rs
new file mode 100644
index 00000000000..f73b63d0cb6
--- /dev/null
+++ b/gcc/testsuite/rust/compile/issue-1786.rs
@@ -0,0 +1,23 @@
+#[lang = "clone"]
+trait Clone {
+    fn clone(&self) -> Self;
+
+    fn clone_from(&mut self, source: &Self) {
+        *self = source.clone()
+    }
+}
+
+#[lang = "copy"]
+pub trait Copy: Clone {
+    // Empty.
+}
+
+mod impls {
+    use super::Clone;
+
+    impl Clone for char {
+        fn clone(&self) -> Self {
+            *self
+        }
+    }
+}