syntax_data: {"ast_node_type":"other","tokens":[{"end":32,"kind":"keyword","start":0,"text":"region_scope:"}]}
source_snippet:     region_scope: region::Scope,
context_before:     /// The scope for the `#[loop_match]` which its `#[const_continue]`s will jump to.
context_after:     /// The place of the state of a `#[loop_match]`, which a `#[const_continue]` must update.