False negative "redundant parentheses" error

[valis]

The warning isn't shown in the following code:

\func test => \Sigma (Nat) (Nat)

[valis]

A similar problem:

\func test => (Array Nat) -> (Array Nat)

[sxhya]

A similar problem:

\func test => (Array Nat) -> (Array Nat)

Duplicate to #302