[COMMITTED] gccrs: bugfix: initialize slice from array in const context

[Arthur Cohen]

From: Faisal Abbas <90.abbasfai...@gmail.com>

gcc/rust/ChangeLog:

        * typecheck/rust-hir-type-check-stmt.cc (TypeCheckStmt::visit): Turn
        constant item typechecking into a coercion site instead of a unify
        site.

gcc/testsuite/ChangeLog:

        * rust/compile/const6.rs: New test.

Signed-off-by: Faisal Abbas <90.abbasfai...@gmail.com>

Tested on x86_64-pc-linux-gnu, committed on master.

---
 gcc/rust/typecheck/rust-hir-type-check-stmt.cc | 2 +-
 gcc/testsuite/rust/compile/const6.rs           | 4 ++++
 2 files changed, 5 insertions(+), 1 deletion(-)
 create mode 100644 gcc/testsuite/rust/compile/const6.rs

diff --git a/gcc/rust/typecheck/rust-hir-type-check-stmt.cc 
b/gcc/rust/typecheck/rust-hir-type-check-stmt.cc
index e82dd8e5300..a55cf22ba23 100644
--- a/gcc/rust/typecheck/rust-hir-type-check-stmt.cc
+++ b/gcc/rust/typecheck/rust-hir-type-check-stmt.cc
@@ -68,7 +68,7 @@ TypeCheckStmt::visit (HIR::ConstantItem &constant)
   TyTy::BaseType *type = TypeCheckType::Resolve (constant.get_type ());
   TyTy::BaseType *expr_type = TypeCheckExpr::Resolve (constant.get_expr ());
 
-  infered = unify_site (
+  infered = coercion_site (
     constant.get_mappings ().get_hirid (),
     TyTy::TyWithLocation (type, constant.get_type ()->get_locus ()),
     TyTy::TyWithLocation (expr_type, constant.get_expr ()->get_locus ()),
diff --git a/gcc/testsuite/rust/compile/const6.rs 
b/gcc/testsuite/rust/compile/const6.rs
new file mode 100644
index 00000000000..8f0dc320129
--- /dev/null
+++ b/gcc/testsuite/rust/compile/const6.rs
@@ -0,0 +1,4 @@
+fn main() {
+    const array:[i32; 1] = [1];
+    const slice:&[i32] = &array;
+}
-- 
2.39.1