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New posts in type-systems

Why `trait X { def append[-](): Unit }` compiles?

scala type-systems

How to understand "The variance position of a method parameter is the opposite of the variance position of the enclosing parameter clause."

scala type-systems

Understanding the Haskell type system in the context of applicatives

Does D have a sufficiently expressive type system to make it feasible to work dynamically?

d type-systems

Why can scala not Infer that Left[X,A] is a reasonable subtype of Either[X,B]?

scala type-systems

I cannot understand what is `Null` in Dart

c# oop scala dart type-systems

How does the Scala type system know that cons + Nil is exhaustive?

Does the C++11 standard guarantee "n2 is int&" by "auto n2 = const_cast<int&>(n);"?

PHP's mixed type vs Typescript's any

php php-7 type-systems typing

F# type functions and a [<GeneralizableValue>] attribute

Why is enum casting allowed even when there is no valid value defined in the enumeration

c# enums type-systems

How to understand the two sentences about "Covariance" and "Contravariance"?

scala type-systems

HowTo get the class of _ :Any

Why doesn't Vec<T> implement the Display trait?

types rust type-systems

List of existentially quantified values in Haskell

Suggestions needed: alternative to overloading "is" and "as" operators in .NET

c# .net type-systems

Haskell MultiParamTypeClasses and UndecidableInstances

What is the top type in the Hack language?

Scala Seq - accept only elements of the same subtype

Explain "C fundamentally has a corrupt type system"

c++ c type-systems