Doc comments - language feature

Example from PureScript:

-- https://github.com/purescript/documentation/blob/master/language/Syntax.md
-- | `bool` performs case analysis for the `Boolean` data type, like an `if` statement.
bool :: forall a. Boolean -> a -> a -> a
bool true x _ = x
bool false _ x = x

Example from F#:

/// Adds 2 numbers
let rec add x y =
 x + y

Example from C3:

/**
 * @param [in] foo "The foo value"
 * @return "the toal foo count"
 **/

Example from Jule:

// Documentation comment for a_function
fn a_function() {}

Example from Speedie:

function Find (|string| pattern, |int| pos=0, |int|)
 description "Returns the position of pattern in self, starting from 'pos'. If not found, we return -1."

Languages with Doc comments include PureScript, F#, C3, Jule, Speedie

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