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feat: expand nominal inline match arms

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Valdemar Høgsvig Lorenzen
2026-10-28 12:39:28 +01:00
parent dc7b2e40e2
commit 5cf9e15661
13 changed files with 908 additions and 49 deletions
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source/sema/check/check.hon
+17 -2
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@@ -1315,7 +1315,7 @@ collect_expression proc(state @mut State, id ast.NodeId) void ! (mem.AllocError
.array_type: {
state.cells[usize(id)].type = invalid_type(try diagnostics.add(state.diagnostics, .type_not_value, ast.node_span(tree, id)))
}
.record_type, .union_type, .enum_type, .distinct_type,
.record_type, .union_type, .enum_type, .distinct_type, .union_tag_type,
.pointer_type, .function_type, .slice_type, .optional_type, .fallible_type, .sum_type: {
type := try check_type_expression(state, id, state.cells[usize(id)].nominal)
if (type.kind != .invalid) {
@@ -3536,7 +3536,7 @@ type_syntax proc(kind ast.ExprKind) bool {
kind == .record_type or kind == .union_type or kind == .enum_type
or kind == .distinct_type or kind == .alias_expr
or kind == .pointer_type or kind == .function_type or kind == .slice_type or kind == .optional_type
or kind == .fallible_type or kind == .sum_type
or kind == .fallible_type or kind == .sum_type or kind == .union_tag_type
)
}
@@ -3576,6 +3576,21 @@ check_type_expression proc(state @mut State, id ast.NodeId, nominal bool) Type !
state.cells[usize(id)].type = type
return type
}
if (kind == .union_tag_type) {
operand :: try check_annotation(state, ast.type_operand(state.tree, id), false)
if (operand.kind == .invalid) return operand
if (operand.kind == .record and operand.nominal == ast.NodeId(maxval!(u32))) {
descriptor :: state.records.items[usize(operand.record_type)]
if (descriptor.is_union and descriptor.tag_type.kind == .enumeration) {
tag :: if (descriptor.declared_tag_type.kind == .enumeration)
descriptor.declared_tag_type else descriptor.tag_type
state.cells[usize(id)].type = tag
return tag
}
}
return invalid_type(try diagnostics.add(state.diagnostics, .invalid_inline_match_subject,
ast.node_span(state.tree, id)))
}
cached := state.cells[usize(id)].type
if (cached.kind == .type_value) {
cached.kind = cached.value_kind