Comments (2)
If a contributor wants to work on this issue, feel free to tackle it in chunks. E.g. adding parser support first. Then in a later PR add name resolution support. During name resolution, we can desugar to a normal constructor expression with positional fields so that no later pass will need to handle these expressions.
MyStruct with field1 = expr1, ..., fieldN = exprN
Can be desugared to
_v1 = expr1
_v2 = expr2
MyStruct _v1 _v2
Where an outer block expression holds variable definitions for each field to preserve order of operations in case the fields need to be rearranged for the constructor expression. The fresh names generated for each variable should also be names that cannot clash with user's variable names. An easy way to achieve this is by prefixing the name with a symbol like $
.
from ante.
The remaining work on this issue is to implement name resolution, type checking, and monomorphization for named constructors. It's likely that after name resolution we'll be able to desugar named constructors into regular constructors, e.g:
MyConstructor with
field3 = expr3
field2 = expr2
field1 = expr1
Will desugar to:
// Fields are brought out into Definitions to preserve evaluation order.
// They're given a name guaranteed not to clash with any identifier in the source program.
$field3 = expr3
$field2 = expr2
$field1 = expr1
MyConstructor $field1 $field2 $field3
from ante.
Related Issues (20)
- Improve Location for "type variable is already in scope" error
- Codegen crash when using a trait that defines multiple methods
- What kind of memory management does ante use? HOT 3
- Adding type annotations to an unbound type variable can crash the compiler HOT 1
- Implement `can Effect` syntax for annotating effects HOT 1
- Check declared variable's types with equality instead of unification HOT 1
- Add a proper error message for unhandled effects
- Incorrect Pointer Offset Calculation When Using -O3 Optimization Level HOT 1
- Add shorthand for casting integer types
- Malloc Panics with -O0 or crane_lift HOT 1
- Require the package name to prefix all imports
- Add `./deps` as a relative root by default
- Add a command-line flag to configure the "relative_root" directories
- Create a LSP server for Ante HOT 3
- WebAssembly HOT 2
- Values declared inside conditional blocks and match arms leak to module export list HOT 2
- Monomorphisation panic HOT 3
- Implement effect variable ellision
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from ante.