chore: test case for empty logic expression

src/AstGen.zig

@@ -757,9 +757,10 @@ fn expr(gi: *GenIr, scope: *Scope, optional_expr: ?*const Ast.Node) InnerError!I
 }
 
 fn exprStmt(gi: *GenIr, scope: *Scope, node: *const Ast.Node) InnerError!Ir.Inst.Ref {
-    // TODO: Maybe we should introduce a unary node type to avoid optional checks?
-    const expr_node = node.data.bin.lhs.?;
-    return expr(gi, scope, expr_node);
+    if (node.data.bin.lhs) |n| {
+        return expr(gi, scope, n);
+    }
+    return .none;
 }
 
 fn inlineLogicExpr(gi: *GenIr, scope: *Scope, node: *const Ast.Node) InnerError!Ir.Inst.Ref {

src/parser_tests.zig

@@ -46,6 +46,18 @@ test "parser: expression statements" {
     );
 }
 
+test "parser: empty expression" {
+    try testEqual(
+        \\~
+    ,
+        \\File "<STDIN>"
+        \\`--BlockStmt <line:1, line:1>
+        \\   `--ExprStmt <line:1, col:2:2>
+        \\
+        ,
+    );
+}
+
 test "parser: temporary variables" {
     try testEqual(
         \\~ temp a = 1 + 2 + 3

testing/regression/syntax/empty-logic.ink

@@ -1 +0,0 @@
-~