in src/CodegenMethodish.hack [79:93]
public function appendToBuilder(HackBuilder $builder): HackBuilder {
$id = '';
if ($this->isManualBody()) {
invariant($this->containingClass, 'The method should belong to a class');
$id = $this->containingClass->getName().'::';
}
$func_declaration = $this->getFunctionDeclaration();
return $this->appendToBuilderBase(
$builder,
$func_declaration,
$this->isAbstract,
$id,
);
}