expect(file_::String, line_::Integer){ … }_{Expected::Output}#⚙

Returns an expect block for the receiver at line in file that’ll yield and expect the warning to be output to $stderr during the execution of the block.

Yield Returns_{::Lookout::Warning}

difference(actual_{::Lookout::Warning})_{Difference::Lookout::Warning^?}#⚙

Returns a difference report between actual and #expected unless they’re #===.