You can use a CodeMirror mode name, or file extension. In general, see the mappings at CodeMirror's meta.js file (but you'll have to find the version of CodeMirror that corresponds to your version of Stash - see Configuring Stash syntax highlighting for a mapping of CodeMirror to Stash versions.
For Objective C, you type
```objective c implementation Blah {} ```
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