Skip to main content

A composition of advanced type systems

Project description

The Hybrid Type System

Row + Implicit arguments + MLF(WIP).

Notes about System F

Before implementing MLF:

choose: forall a. a -> a -> a
auto  : forall a. a -> a
(choose auto) : (forall a. a —> a) -> (forall a. a -> a)

// if auto is defined without annotations, polymorphisms of lambdas get lost
auto2 : a -> a
(choose auto) : (a -> a) -> (a -> a)  

Notes about System F-Omega

Kind checker is not implemented.


from hybridts.tc_state import TCState
from hybridts.type_encoding import row_of_map, record_of_row, poly_row, empty_row

tctx = {}

tcs = TCState(tctx)

x1 = tcs.new_var()
x2 = tcs.new_var()

int_t = tcs.mk_new_type("") # nominal type
tcs.unify(x1, int_t)
tcs.unify(x1, x2)

assert tcs.infer(x1) == int_t
assert tcs.infer(x2) == int_t

x3 = tcs.new_var()

r1 = row_of_map({'a': x1, 'b': x3}, empty_row)
r1 = record_of_row(r1)
tho = tcs.new_var()
r2 = row_of_map({'a': x3}, poly_row(tho))
r2 = record_of_row(r2)
tcs.unify(r1, r2)

# (RecordT, (RowConsT, 'b', (NomT, ''), (RowConsT, 'a', (NomT, ''), (RowMonoT,))))
# (RecordT, (RowConsT, 'a', (NomT, ''), (RowPolyT, (RecordT, (RowConsT, 'b', (NomT, ''), (RowMonoT,)

Project details

Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Source Distributions

No source distribution files available for this release. See tutorial on generating distribution archives.

Built Distribution

hybrid_type_system-0.2-py3-none-any.whl (7.8 kB view hashes)

Uploaded py3

Supported by

AWS AWS Cloud computing and Security Sponsor Datadog Datadog Monitoring Fastly Fastly CDN Google Google Download Analytics Microsoft Microsoft PSF Sponsor Pingdom Pingdom Monitoring Sentry Sentry Error logging StatusPage StatusPage Status page