Macro ok 

ok!() { /* proc-macro */ }

Ok wrapper macro - wraps result in Ok(…) with automatic span field

Syntax:

ok!(Type { field1 = expr1, field2, ... })

Example:

ok!(TexHandler2 { operands, name=foo.to_string() })
// Expands to: Ok(TexHandler2 { operands: operands, name: foo.to_string(), span: span })