<What is it called and what does it mean when a fu...

# stackoverflow

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What is it called and what does it mean when a function "equals" another function and provides a body?
Like in this expression:
fun main() = runBlocking { ... }

Are we executing the runBlocking function and passing the { } body in as a functional argument?
What is this called?
I know it immediately executes main because of the parens.