Yes. That's escape analysis. But this is not what OP did.
What you wrote is not the same in C and Go, because GC and escape analysis. But 9rx is also correct that what OP wrote is the same in C and Go.
So OP almost learned about escape analysis, but their example didn't actually do it. So double confusion on their side.
Well, my point is that escape analysis has nothing to do with it at the semantic level. So it's actually just 'because GC'. You don't need the concept of escape analysis at all to understand the behavior of the Go example.