Add 'Pass By'.

www/js/interpreter.ts

@@ -517,6 +517,8 @@ function moveAsLowLevelMoves({ move, nextMove, startingPos, numProgessions }: {
           kind: PositionKind.Circle,
           which: startPos.which,
           facing: startPos.which.facingAcross(),
+          setOffset: startPos.setOffset,
+          lineOffset: startPos.lineOffset,
         }
 
         return combine([{
@@ -1860,6 +1862,24 @@ function moveAsLowLevelMoves({ move, nextMove, startingPos, numProgessions }: {
         });
       }
 
+    case "pass by":
+      const passByShoulder = move.parameters.shoulder ? Hand.Left : Hand.Right;
+      return handlePairedMove(move.parameters.who, ({startPos, around, withPos}) => {
+        return combine([{
+          beats: move.beats,
+          // TODO Is pass by always a swap?
+          endPosition: withPos,
+          movementPattern: {
+            kind: SemanticAnimationKind.PassBy,
+            around,
+            facing: "Forward",
+            otherPath: "Swap",
+            side: passByShoulder,
+            withHands: false,
+          }
+        }], startPos);
+      });
+
     case "pass through":
       if (move.parameters.dir === "left diagonal" || move.parameters.dir === "right diagonal") {
         // TODO There's logic for this below, but unsure it's right.