Add `intrinsics.type_has_field`

1 files changed, 28 insertions, 0 deletions

diff --git a/src/check_expr.cpp b/src/check_expr.cpp
index 3e5dd58f5..aea72c9b3 100644
--- a/src/check_expr.cpp
+++ b/src/check_expr.cpp
@@ -5702,6 +5702,34 @@ bool check_builtin_procedure(CheckerContext *c, Operand *operand, Ast *call, i32
 		operand->type = t_untyped_bool;
 		break;
 
+	case BuiltinProc_type_has_field:
+		{
+			Operand op = {};
+			Type *bt = check_type(c, ce->args[0]);
+			Type *type = base_type(bt);
+			if (type == nullptr || type == t_invalid) {
+				error(ce->args[0], "Expected a type for '%.*s'", LIT(builtin_name));
+				return false;
+			}
+			Operand x = {};
+			check_expr(c, &x, ce->args[1]);
+
+			if (!is_type_string(x.type) || x.mode != Addressing_Constant || x.value.kind != ExactValue_String) {
+				error(ce->args[1], "Expected a const string for field argument");
+				return false;
+			}
+
+			String field_name = x.value.value_string;
+
+			Selection sel = lookup_field(type, field_name, false);
+			operand->mode = Addressing_Constant;
+			operand->value = exact_value_bool(sel.index.count != 0);
+			operand->type = t_untyped_bool;
+
+			break;
+		}
+		break;
+
 	case BuiltinProc_type_is_specialization_of:
 		{
 			if (operand->mode != Addressing_Type) {