the `ctx: Current` should have an accociated span; event ought be within a span.

logging-error

ctx: Current { inner: None }
Event: Event { fields: ValueSet { query: Set { key: "somekey", value: "somevalue" }, callsite: Identifier(0x10af28f90) }, metadata: Metadata { name: "event src/main.rs:126", target: "application_repro", level: Level(Trace), module_path: "application_repro", location: src/main.rs:126, fields: {query}, callsite: Identifier(0x10af28f90), kind: Kind(Event) }, parent: Current }
ctx: Current { inner: None }
Event: Event { fields: ValueSet { response: Response { status: 200, version: HTTP/1.1, headers: {}, body: Body(Empty) }, callsite: Identifier(0x10af28f80) }, metadata: Metadata { name: "event src/main.rs:131", target: "application_repro", level: Level(Trace), module_path: "application_repro", location: src/main.rs:131, fields: {response}, callsite: Identifier(0x10af28f80), kind: Kind(Event) }, parent: Current }
Span: Span { name: "Task::run", parent: None, metadata: Metadata { name: "Task::run", target: "tokio_executor::threadpool::task", level: Level(Trace), module_path: "tokio_executor::threadpool::task", location: /Users/dbarsky/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-executor-0.2.0-alpha.6/src/threadpool/task/mod.rs:116, fields: {}, callsite: Identifier(0x10af29130), kind: Kind(Span) }, fields: "" }