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* Closes #1964 Adds the possibility to define operator fixities. They live in a separate namespace. Standard library defines a few in `Stdlib.Data.Fixity`: ``` syntax fixity rapp {arity: binary, assoc: right}; syntax fixity lapp {arity: binary, assoc: left, same: rapp}; syntax fixity seq {arity: binary, assoc: left, above: [lapp]}; syntax fixity functor {arity: binary, assoc: right}; syntax fixity logical {arity: binary, assoc: right, above: [seq]}; syntax fixity comparison {arity: binary, assoc: none, above: [logical]}; syntax fixity pair {arity: binary, assoc: right}; syntax fixity cons {arity: binary, assoc: right, above: [pair]}; syntax fixity step {arity: binary, assoc: right}; syntax fixity range {arity: binary, assoc: right, above: [step]}; syntax fixity additive {arity: binary, assoc: left, above: [comparison, range, cons]}; syntax fixity multiplicative {arity: binary, assoc: left, above: [additive]}; syntax fixity composition {arity: binary, assoc: right, above: [multiplicative]}; ``` The fixities are identifiers in a separate namespace (different from symbol and module namespaces). They can be exported/imported and then used in operator declarations: ``` import Stdlib.Data.Fixity open; syntax operator && logical; syntax operator || logical; syntax operator + additive; syntax operator * multiplicative; ```
10 lines
157 B
Plaintext
10 lines
157 B
Plaintext
module DuplicateOperator;
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syntax fixity add {arity: binary};
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syntax operator + add;
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syntax operator + add;
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axiom + : Type → Type → Type;
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end;
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