Function trace_error::backtrace::format_trace

pub fn format_trace<Fmt: BacktraceFmt>(header: bool,
                                       line: u32,
                                       file: &str)
                                       -> String

Generates a formatted backtrace (via Fmt type) from here, but expects line and file to be where it was called from.

The actual call to format_trace and trace are ignored.