Bad semantic highlighting on lambda with parenthesis

[buzden]

Steps to Reproduce

Typecheck the following code

import Data.DPair

f : Exists List -> Unit
f = \(Evidence _ _) => ()

in an editor with semantic highlighting or use katla to generate semantically highlighted html.

Expected Behavior

Parenthesis are not highlighted specially or highlighted as a keyword.

Observed Behavior

Opening parenthesis is highlighted as a type constructor, e.g.

(here dark blue is for type constructors).