error: Your local changes to the following files would be overwritten by merge in github code example

Example 1: error: Your local changes to the following files would be overwritten by merge:

git checkout HEAD^ file/to/overwrite
git pull

Example 2: error: Your local changes to the following files would be overwritten by checkout:

git stash save your-file-name
git checkout master
# do whatever you had to do with master
git checkout staging
git stash pop