Remove "return struct" in rule implementation of some Bazel tests (#2)

This makes the affected tests compatible with --incompatible_disallow_struct_provider_syntax

Progress toward #7347.

RELNOTES: None.
PiperOrigin-RevId: 244210656
diff --git a/src/test/java/com/google/devtools/build/lib/analysis/AspectTest.java b/src/test/java/com/google/devtools/build/lib/analysis/AspectTest.java
index a26e17f..08df7c2 100644
--- a/src/test/java/com/google/devtools/build/lib/analysis/AspectTest.java
+++ b/src/test/java/com/google/devtools/build/lib/analysis/AspectTest.java
@@ -599,11 +599,11 @@
         "x/extension.bzl",
         "def _aspect_impl(target, ctx):",
         "  ctx.actions.do_nothing(mnemonic='Mnemonic')",
-        "  return struct()",
+        "  return []",
         "aspect1 = aspect(_aspect_impl, attr_aspects=['deps'])",
         "aspect2 = aspect(_aspect_impl, attr_aspects=['extra_deps'])",
         "def _rule_impl(ctx):",
-        "  return struct()",
+        "  return []",
         "injector1 = rule(_rule_impl, attrs = { 'deps' : attr.label_list(aspects = [aspect1]) })",
         "null_rule = rule(_rule_impl, attrs = { 'deps' : attr.label_list() })",
         "injector2 = rule(",
@@ -664,17 +664,16 @@
         "x/extension.bzl",
         "def _aspect_impl(target, ctx):",
         "  ctx.actions.do_nothing(mnemonic='Mnemonic')",
-        "  return struct()",
+        "  return []",
         "aspect1 = aspect(_aspect_impl, attr_aspects=['deps'], attrs =",
         "    {'param': attr.string(values = ['a', 'b'])})",
         "aspect2 = aspect(_aspect_impl, attr_aspects=['deps'])",
         "def _rule_impl(ctx):",
-        "  return struct()",
+        "  return []",
         "injector1 = rule(_rule_impl, attrs =",
         "    { 'deps' : attr.label_list(aspects = [aspect1]), 'param' : attr.string() })",
         "injector2 = rule(_rule_impl, attrs = { 'deps' : attr.label_list(aspects = [aspect2]) })",
-        "null_rule = rule(_rule_impl, attrs = { 'deps' : attr.label_list() })"
-    );
+        "null_rule = rule(_rule_impl, attrs = { 'deps' : attr.label_list() })");
 
     scratch.file(
         "pkg1/BUILD",