removed extra new lines

src/pprint.ts

@@ -43,6 +43,14 @@ function loc_to_ns(loc: Loc): ns {
     }
   }
 
+  function strip_trailing_newline(x: ns): ns {
+    if (Array.isArray(x) && x.length == 2 && x[1] === "\n") {
+      return x[0];
+    } else {
+      return x;
+    }
+  }
+
   function ns_list(tag: list_tag, ls: ns[]): ns {
     switch (tag) {
       case "arrow_function":
@@ -53,9 +61,13 @@ function loc_to_ns(loc: Loc): ns {
       case "program":
       case "statement_block":
       case "slice":
-        return ls.map((x) => [x, "\n\n"]);
+        return [
+          ls.map(strip_trailing_newline).map((x, i) => (i === ls.length - 1 ? x : [x, "\n"])),
+          "\n",
+        ];
+      default:
+        return ls;
     }
-    return ls;
   }
 
   const lp = "/*>>>*/";

tests/arrow-function-1.ts.expanded

@@ -1,7 +1,5 @@
 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

@@ -1,9 +1,6 @@
 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.expanded

@@ -1,6 +1,5 @@
 const foo_3 = (x_5) => {
   x_5;
-
   x_5;
 };
 ================================

tests/test-1.ts.expanded

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

tests/test-2.ts.expanded

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

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

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

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

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

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

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