Do not force anonymous lifetimes in consts to be static.

Author: cjgillot

compiler/rustc_resolve/src/late.rs

@@ -656,7 +656,7 @@ impl<'a: 'ast, 'ast, 'tcx> Visitor<'ast> for LateResolutionVisitor<'a, '_, 'ast,
     fn visit_anon_const(&mut self, constant: &'ast AnonConst) {
         // We deal with repeat expressions explicitly in `resolve_expr`.
         self.with_lifetime_rib(LifetimeRibKind::AnonConst, |this| {
-            this.with_lifetime_rib(LifetimeRibKind::Elided(LifetimeRes::Static), |this| {
+            this.with_lifetime_rib(LifetimeRibKind::Elided(LifetimeRes::Infer), |this| {
                 this.resolve_anon_const(constant, IsRepeatExpr::No);
             })
         })
@@ -4130,7 +4130,7 @@ impl<'a: 'ast, 'b, 'ast, 'tcx> LateResolutionVisitor<'a, 'b, 'ast, 'tcx> {
             ExprKind::Repeat(ref elem, ref ct) => {
                 self.visit_expr(elem);
                 self.with_lifetime_rib(LifetimeRibKind::AnonConst, |this| {
-                    this.with_lifetime_rib(LifetimeRibKind::Elided(LifetimeRes::Static), |this| {
+                    this.with_lifetime_rib(LifetimeRibKind::Elided(LifetimeRes::Infer), |this| {
                         this.resolve_anon_const(ct, IsRepeatExpr::Yes)
                     })
                 });

tests/ui/lifetimes/elided-lifetime-in-anon-const.rs

@@ -0,0 +1,20 @@
+// Verify that elided lifetimes inside anonymous constants are not forced to be `'static`.
+// check-pass
+
+fn foo() -> [(); {
+       let a = 10_usize;
+       let b: &'_ usize = &a;
+       *b
+   }] {
+    [(); 10]
+}
+
+fn bar() -> [(); 10] {
+    [(); {
+        let a = 10_usize;
+        let b: &'_ usize = &a;
+        *b
+    }]
+}
+
+fn main() {}