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-Explanation: Expressions can only reference previously introduced (i.e. "bound")
-variables that are still "in scope"
-
-For example, the following valid expressions introduce a "bound" variable named
-❰x❱:
-
-
- ┌─────────────────┐
- │ λ(x : Bool) → x │ Anonymous functions introduce "bound" variables
- └─────────────────┘
- ⇧
- This is the bound variable
-
-
- ┌─────────────────┐
- │ let x = 1 in x │ ❰let❱ expressions introduce "bound" variables
- └─────────────────┘
- ⇧
- This is the bound variable
-
-
-However, the following expressions are not valid because they all reference a
-variable that has not been introduced yet (i.e. an "unbound" variable):
-
-
- ┌─────────────────┐
- │ λ(x : Bool) → y │ The variable ❰y❱ hasn't been introduced yet
- └─────────────────┘
- ⇧
- This is the unbound variable
-
-
- ┌──────────────────────────┐
- │ (let x = True in x) && x │ ❰x❱ is undefined outside the parentheses
- └──────────────────────────┘
- ⇧
- This is the unbound variable
-
-
- ┌────────────────┐
- │ let x = x in x │ The definition for ❰x❱ cannot reference itself
- └────────────────┘
- ⇧
- This is the unbound variable
-
-
-Some common reasons why you might get this error:
-
-● You misspell a variable name, like this:
-
-
- ┌────────────────────────────────────────────────────┐
- │ λ(empty : Bool) → if emty then "Empty" else "Full" │
- └────────────────────────────────────────────────────┘
- ⇧
- Typo
-
-
-● You misspell a reserved identifier, like this:
-
-
- ┌──────────────────────────┐
- │ foral (a : Type) → a → a │
- └──────────────────────────┘
- ⇧
- Typo
-
-
-● You tried to define a recursive value, like this:
-
-
- ┌─────────────────────┐
- │ let x = x + +1 in x │
- └─────────────────────┘
- ⇧
- Recursive definitions are not allowed
-
-
-● You accidentally forgot a ❰λ❱ or ❰∀❱/❰forall❱
-
-
- Unbound variable
- ⇩
- ┌─────────────────┐
- │ (x : Bool) → x │
- └─────────────────┘
- ⇧
- A ❰λ❱ here would transform this into a valid anonymous function
-
-
- Unbound variable
- ⇩
- ┌────────────────────┐
- │ (x : Bool) → Bool │
- └────────────────────┘
- ⇧
- A ❰∀❱ or ❰forall❱ here would transform this into a valid function type