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* Closes #1992 A function identifier `fun` can be declared as an iterator with ``` syntax iterator fun; ``` For example: ```haskell syntax iterator for; for : {A B : Type} -> (A -> B -> A) -> A -> List B -> List A; for f acc nil := acc; for f acc (x :: xs) := for (f acc x) xs; ``` Iterator application syntax allows for a finite number of initializers `acc := a` followed by a finite number of ranges `x in xs`. For example: ``` for (acc := 0) (x in lst) acc + x ``` The number of initializers plus the number of ranges must be non-zero. An iterator application ``` fun (acc1 := a1; ..; accn := an) (x1 in b1; ..; xk in bk) body ``` gets desugared to ``` fun \{acc1 .. accn x1 .. xk := body} a1 .. an b1 .. bk ``` The `acc1`, ..., `accn`, `x1`, ..., `xk` can be patterns. The desugaring works on a purely syntactic level. Without further restrictions, it is not checked if the number of initializers/ranges matches the type of the identifier. The restrictions on the number of initializers/ranges can be specified in iterator declaration: ``` syntax iterator fun {init: n, range: k}; syntax iterator for {init: 1, range: 1}; syntax iterator map {init: 0, range: 1}; ``` The attributes (`init`, `range`) in between braces are parsed as YAML to avoid inventing and parsing a new attribute language. Both attributes are optional. |
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| 230 | ||
| 258 | ||
| 265 | ||
| BindGroupConflict | ||
| Dependencies | ||
| ImportCycle | ||
| Internal | ||
| issue1337 | ||
| issue1344 | ||
| issue1700 | ||
| NoDependencies | ||
| StdlibConflict | ||
| Termination | ||
| UsingHiding | ||
| AmbiguousConstructor.juvix | ||
| AmbiguousExport.juvix | ||
| AmbiguousModule.juvix | ||
| AmbiguousSymbol.juvix | ||
| AppLeftImplicit.juvix | ||
| AsPatternAlias.juvix | ||
| ConstructorExpectedLeftApplication.juvix | ||
| DanglingJudoc.juvix | ||
| DuplicateClause.juvix | ||
| DuplicateFixity.juvix | ||
| DuplicateInductiveParameterName.juvix | ||
| ImplicitPatternLeftApplication.juvix | ||
| InfixError.juvix | ||
| InfixErrorP.juvix | ||
| Iterators1.juvix | ||
| Iterators2.juvix | ||
| Iterators3.juvix | ||
| Iterators4.juvix | ||
| Iterators5.juvix | ||
| juvix.yaml | ||
| LacksFunctionClause.juvix | ||
| LacksTypeSig2.juvix | ||
| LacksTypeSig.juvix | ||
| LetMissingClause.juvix | ||
| ModuleNotInScope.juvix | ||
| MultipleDeclarations.juvix | ||
| MultipleExportConflict.juvix | ||
| NestedAsPatterns.juvix | ||
| NestedPatternBraces.juvix | ||
| NotInScope.juvix | ||
| PragmasFormat.juvix | ||
| PragmasYAML.juvix | ||
| QualSymNotInScope.juvix | ||
| Tab.juvix | ||
| UnusedOperatorDef.juvix | ||
| WrongModuleName.juvix | ||