Failing test for fbt issue

Specifically, the fbt plugin would error on a `null` loc as it [relies on it in 
one of its 
utils](https://github.com/facebook/fbt/blob/6a23a5374a757a49654d8304a3efea8eb9548eea/packages/babel-plugin-fbt/src/getNamespacedArgs.js#L82-L84), 
implying a missing `loc` somewhere in our pipeline after codegen

compiler/forget/src/__tests__/fixtures/compiler/error.lambda-with-fbt.expect.md

@@ -0,0 +1,45 @@
+
+## Input
+
+```javascript
+import { fbt } from "fbt";
+
+function Component() {
+  const buttonLabel = () => {
+    if (!someCondition) {
+      return <fbt desc="My label">{"Purchase as a gift"}</fbt>;
+    } else if (
+      !iconOnly &&
+      showPrice &&
+      item?.current_gift_offer?.price?.formatted != null
+    ) {
+      return (
+        <fbt desc="Gift button's label">
+          {"Gift | "}
+          <fbt:param name="price">
+            {item?.current_gift_offer?.price?.formatted}
+          </fbt:param>
+        </fbt>
+      );
+    } else if (!iconOnly && !showPrice) {
+      return <fbt desc="Gift button's label">{"Gift"}</fbt>;
+    }
+  };
+
+  return (
+    <View>
+      <Button text={buttonLabel()} />
+    </View>
+  );
+}
+
+```
+
+
+## Error
+
+```
+Cannot read properties of null (reading 'end')
+```
+          
+      

compiler/forget/src/__tests__/fixtures/compiler/error.lambda-with-fbt.js

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+import { fbt } from "fbt";
+
+function Component() {
+  const buttonLabel = () => {
+    if (!someCondition) {
+      return <fbt desc="My label">{"Purchase as a gift"}</fbt>;
+    } else if (
+      !iconOnly &&
+      showPrice &&
+      item?.current_gift_offer?.price?.formatted != null
+    ) {
+      return (
+        <fbt desc="Gift button's label">
+          {"Gift | "}
+          <fbt:param name="price">
+            {item?.current_gift_offer?.price?.formatted}
+          </fbt:param>
+        </fbt>
+      );
+    } else if (!iconOnly && !showPrice) {
+      return <fbt desc="Gift button's label">{"Gift"}</fbt>;
+    }
+  };
+
+  return (
+    <View>
+      <Button text={buttonLabel()} />
+    </View>
+  );
+}