Add missing rule identifier for const outer generics
In the section on const contexts, we have a rule about when outer
generics cannot be used. This was missing a rule identifier, so the
text appeared to be part of the preceding rule. Let's fix that.
diff --git a/src/const_eval.md b/src/const_eval.md
index 0b89aff..2d73e1f 100644
--- a/src/const_eval.md
+++ b/src/const_eval.md
@@ -248,6 +248,7 @@
r[const-eval.const-context.block]
* A [const block]
+r[const-eval.const-context.outer-generics]
Const contexts that are used as parts of types (array type and repeat length
expressions as well as const generic arguments) can only make restricted use of
surrounding generic parameters: such an expression must either be a single bare
