git branch -d gives warning

Question

Just want to get a better understanding of the warning message after I deleted a local branch

warning: deleting branch \'old_branch\' that ha

Answer 1

This means your local branch old_branch is up to date with remote branch old_branch on remote origin but it is not merged to the branch master which is considered to be the main branch in the repo.

It is just a precaution from git. It gives you a hint: maybe you did your job in the topic-branch and forget to merge it to the main branch?

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update

Git warns you from losing your changes. For example if you do not have your old_branch on the master git then don't allow you to even delete branch that is unmerged to the master (well it allow, but with key -D which is force-delete option).