kewrite!() { /* proc-macro */ }Expand description
Write a set of values into a Formatter, stopping as soon as a value doesn’t fit the specification for its field.
Contrary to keformat doesn’t build the Formatter into a Key Expression.
kewrite!($formatter, $($ident [= $expr]),*) will attempt to write $expr into their respective $ident fields for $formatter.
$formatter must be an expression that dereferences to &mut Formatter.
$expr must resolve to a value that implements core::fmt::Display.
$expr defaults to $ident if omitted.
This macro always results in an expression that resolves to Result<&mut Formatter, FormatSetError>.