diff options
Diffstat (limited to 'stdlib/source/lux/type/abstract.lux')
| -rw-r--r-- | stdlib/source/lux/type/abstract.lux | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/stdlib/source/lux/type/abstract.lux b/stdlib/source/lux/type/abstract.lux index 9a991a2a9..d3f3eb118 100644 --- a/stdlib/source/lux/type/abstract.lux +++ b/stdlib/source/lux/type/abstract.lux @@ -49,8 +49,8 @@ plist' (#.Cons [k' v'] (remove k plist'))))) -(def: down-cast Text "@abstract") -(def: up-cast Text "@repr") +(def: down-cast Text "@abstraction") +(def: up-cast Text "@representation") (def: macro-anns Code (' {#.macro? true})) (def: representation-name @@ -164,3 +164,13 @@ (` ((~! install-casts) (~ (code.local-symbol name)) [(~+ type-varsC)])) (list/compose primitives (list (` ((~! un-install-casts))))))))) + +(syntax: #export (^@representation [name (s.form s.local-symbol)] body [branches (p.some s.any)]) + (let [g!representation (code.local-symbol name)] + (do @ + [current-module macro.current-module-name + #let [g!@representation (code.symbol [current-module "@representation"])]] + (wrap (list& g!representation + (` (.let [(~ g!representation) ((~ g!@representation) (~ g!representation))] + (~ body))) + branches))))) |