fixed printing of slice and added extra newlines

src/pprint.ts

@@ -52,7 +52,8 @@ function loc_to_ns(loc: Loc): ns {
         return ["(", ls, ")"];
       case "program":
       case "statement_block":
-        return ls.map((x) => [x, "\n"]);
+      case "slice":
+        return ls.map((x) => [x, "\n\n"]);
     }
     return ls;
   }
@@ -104,6 +105,6 @@ export async function pprint(loc: Loc) {
     });
     return pretty;
   } catch (err) {
-    return src;
+    return `/* !!not pretty!! */\n${src}`;
   }
 }

tests/arrow-function-1.ts.expanded

@@ -1,5 +1,7 @@
 const f_3 = (x_9) => x_9;
+
 const g_5 = (x_9) => f_3(x_9);
+
 const h_7 = (x_9) => x_9((x_12) => f_3(x_12));
 ================================
 DONE

tests/splice-1.ts.expanded

@@ -1,6 +1,9 @@
 const t_3 = 13;
+
 const x_5 = 17;
+
 const y_7 = x_5 + t_3;
+
 const q_9 = t_3 + x_5;
 ================================
 DONE

tests/splice-2.ts

@@ -0,0 +1,6 @@
+const foo = (x) => {
+  using_syntax_rules([t,t,x]).rewrite(splice(() => {
+    t;
+    t;
+  }));  
+}

tests/splice-2.ts.expanded

@@ -0,0 +1,7 @@
+const foo_3 = (x_5) => {
+  x_5;
+
+  x_5;
+};
+================================
+DONE

tests/test-1.ts.expanded

@@ -1,4 +1,5 @@
 const x_3 = 12;
+
 x_3;
 ================================
 DONE

tests/test-2.ts.expanded

@@ -1,4 +1,5 @@
 const x_3 = 12;
+
 x_3 + x_3;
 ================================
 DONE

tests/using-syntax-rules-2.ts.expanded

@@ -1,4 +1,5 @@
 x_8 + x_8;
+
 const x_8 = 12;
 ================================
 DONE

tests/using-syntax-rules-3.ts.expanded

@@ -1,4 +1,5 @@
 (foo_8) => x_6 + x_6;
+
 const x_6 = 12;
 ================================
 DONE

tests/using-syntax-rules-4.ts.expanded

@@ -1,4 +1,5 @@
 x_7 + ((foo_9, foo_11) => foo_11 + foo_9);
+
 const x_7 = 12;
 ================================
 DONE