dependency: don't try and expand yourself.

This can happen on e.g. fossil where the dependency HEAD requires having
an install of fossil in order to check it out. Bit of a silly edge case
but this handles it.

Fixes Homebrew/homebrew#25605

1 files changed, 1 insertions, 0 deletions

diff --git a/Library/Homebrew/dependency.rb b/Library/Homebrew/dependency.rb
index e2a810cfe..1ed921cc3 100644
--- a/Library/Homebrew/dependency.rb
+++ b/Library/Homebrew/dependency.rb
@@ -85,6 +85,7 @@ class Dependency
         when :keep_but_prune_recursive_deps
           [dep]
         else
+          next [] if dependent.to_s == dep.name
           expand(dep.to_formula, &block) << dep
         end
       end.flatten