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- closes #1991 This pr implements named arguments as described in #1991. It does not yet implement optional arguments, which should be added in a later pr as they are not required for record syntax. # Syntax Overview Named arguments are a convenient mehcanism to provide arguments, where we give the arguments by name instead of by position. Anything with a type signature can have named arguments, i.e. functions, types, constructors and axioms. For instance, if we have (note that named arguments can also appear on the rhs of the `:`): ``` fun : {A B : Type} (f : A -> B) : (x : A) -> B := ... ; ``` With the traditional positional application, we would write ``` fun suc zero ``` With named arguments we can write the following: 1. `fun (f := suc) (x := zero)`. 2. We can change the order: `fun (x := zero) (f := suc)`. 3. We can group the arguments: `fun (x := zero; f := suc)`. 4. We can partially apply functions with named arguments: `fun (f := suc) zero`. 5. We can provide implicit arguments analogously (with braces): `fun {A := Nat; B := Nat} (f := suc; x := zero)`. 6. We can skip implicit arguments: `fun {B := Nat} (f := suc; x := zero)`. What we cannot do: 1. Skip explicit arguments. E.g. `fun (x := zero)`. 2. Mix explicit and implicit arguments in the same group. E.g. `fun (A := Nat; f := suc)` 3. Provide explicit and implicit arguments in different order. E.g. `fun (f := suc; x := zero) {A := Nat}`. |
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