in Sources/SwiftSyntax/SyntaxClassifier.swift [212:224]
mutating func advanceToNextToken() -> Bool {
repeat {
if advanceToFirstChild() { continue }
if !advanceToNextSibling() { return false }
guard node.offset < absRange.endOffset else {
finished = true
return false
}
} while !node.raw.isToken
return true
}