fn insert_label_after_token(
editor: &SyntaxEditor,
token: &SyntaxToken,
ctx: &AssistContext<'_, '_>,
builder: &mut SourceChangeBuilder,
)fn insert_label_after_token(
editor: &SyntaxEditor,
token: &SyntaxToken,
ctx: &AssistContext<'_, '_>,
builder: &mut SourceChangeBuilder,
)