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e.g. makeFunc

e.g. in makeFunc

bike shedding

general advice

Here params :: LispVal -> [String] will fail for ever LispVal that is not a function. Better use a separate Type and let the sum type simple. e.g.:

use meaningful names

get rid of meaningless type synonyms (ThrowError, IOThrowError)

use Applicative style when parsing

avoid shadow bindings

supply type signatures for all toplevel functions

use pure values and functions whenever possible

try to reject invalid scheme programs before interpreting them

Bike shedding

General advice

Here params :: LispVal -> [String] will fail for ever LispVal that is not a function. Better use a separate type and let the sum type simple. e.g.:

Use meaningful names

Get rid of meaningless type synonyms (ThrowError, IOThrowError)

Use Applicative style when parsing

Avoid shadow bindings

Supply type signatures for all toplevel functions

Use pure values and functions whenever possible

Try to reject invalid scheme programs before interpreting them

readOrThrow parser input = left Parser $ parse parser "lisp"

readOrThrow parser input = left Parser $ parse parser "lisp"