HKU PL Group
We are a group of programming language researchers who study topics about functional language design, type theory, compilers and program analysis.
The University of Hong Kong
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Disjoint Intersection Types
Calculi about disjoint intersection types enable an highly modular and compositional programming style that addresses the Expression Problem naturally, and allows for a much more dynamic form of inheritance.
Compositional Programming
Those works present a novel modular programming style.
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Typed First-Class Traits ECOOP 18
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Compositional Programming TOPLAS
Gradual Typing
This work presents a generalized definition of consistent subtyping that works for polymorphic types.
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Consistent Subtyping for All TOPLAS
Dependent Types
Those works propose a unified syntax that accounts for types and terms which still preserves decidable type-checking.
Higher-Ranked Polymorphism
This paper provides the first mechanized formalization of type inference for higher-ranked polymorphism.
Kind Inference
This work proposes a solution of challenge of kind inference for datatype declarations for Haskell98 and modern Haskell.
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Kind Inference for Datatypes POPL 20
Subtyping for Iso-recursive Types
A new iso-recursive subtyping formulation which takes advantage over other designs on both theoretical side and implementation side.
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Revisiting Iso-Recursive Subtyping OOPSLA 20
Bi-directional Type Checking
This paper presents a variant of bi-directional type checking where the type information flows from arguments to functions.
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Let Arguments go First ESOP 18
Intersection and Union Types
This paper proposes a novel methodology for designing subtyping relations that exploits duality between intersection types and union types.
Type-directed Operational Semantics
Type-directed operational semantics(TDOS) is a variant of small-step operational semantics. In TDOS, type annotations become operationally relevant and can affect the result of a program.
Members
Faculty
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Bruno C. d. S. Oliveira Associate Professor
Current Members
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Xuejing (Snow) Huang PhD student
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Yaoda Zhou PhD student
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Baber Rehman PhD student
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Mingqi (Alvin) Xue PhD student
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Yaozhu Sun PhD student
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Wenjia Ye PhD student
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Xu Xue MPhil student
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Chen Cui PhD student
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Jinhao Tan PhD student
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Shengyi Jiang PhD student
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Litao (Tony) Zhou PhD student (incoming)
Alumni
Seminar
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Revisiting type disjointness
Jul 27, 2021
In this problem session, we will go over the existing definitions of type disjointness and discuss an alternative approach proposed by Jimmy. -
Applicative Intersection Types
Jul 6, 2021
λi adopts a classical bidirectional type checking and gives rise to many type annotations in the process of function application. In this seminar talk, I will give an introduction to... -
Type-Directed Operational Semantics for Gradual Typing
Jun 22, 2021
The semantics of gradually typed languages is typically given indirectly via an elaboration into a cast calculus. This contrasts with more conventional formulations of programming language semantics, where the semantics... -
A Dependently Typed Calculus with Polymorphic Subtyping
Jun 22, 2021
A polymorphic subtyping relation, which relates more general types to more specific ones, is at the core of many modern functional languages. As those languages start moving towards dependently typed... -
Revisiting Iso-recrusive Subtyping
May 25, 2021
The Amber rules are well-known and widely used for subtyping iso-recursive types. They were first briefly and informally introduced in 1985 by Cardelli in a manuscript describing the Amber language....
