o76923, (edited ) 
Wait...
def foo(bar): return bar{ "id": 1234, "body": "Hello World!" }HAI 1.2 CAN HAS STDIO? VISIBLE "HAI WORLD!" KTHXBYEOMG #Sharkey supports language sensitive syntax highlighting of code in MFM! #Firefish nominally did but only had support for 11 syntaxes.
To use it, put the language name in the same line as the triple tick at the start. It probably supports the Prism.js list of 297 languages.
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