feat: Handle literal comparisons that use = and comprehensions without loops

- emit AssertCondition for equality-only assignment plans (outside soft-assert mode) so rules like `0 = 1` fail under the VM just like the interpreter
- let comprehension bodies consume assertion failures by advancing or exiting their iteration context, both in run-to-completion and suspendable execution

Signed-off-by: Anand Krishnamoorthi <anakrish@microsoft.com>

tests/opa.rs

@@ -22,14 +22,10 @@ const OPA_BRANCH: &str = "v1.2.0";
 const OPA_TODO_FOLDERS: &[&str] = &[
     "aggregates",
     "baseandvirtualdocs",
-    "comparisonexpr",
     "dataderef",
     "defaultkeyword",
-    "disjunction",
     "elsekeyword",
-    "eqexpr",
     "every",
-    "example",
     "fix1863",
     "functions",
     "partialdocconstants",
@@ -38,7 +34,6 @@ const OPA_TODO_FOLDERS: &[&str] = &[
     "refheads",
     "sets",
     "type",
-    "varreferences",
     "virtualdocs",
     "walkbuiltin",
     "withkeyword",

tests/rvm/rego/cases/comparisons.yaml

@@ -48,3 +48,15 @@ cases:
         }
     query: data.test.main
     want_result: true
+
+  - note: equality_literal_failure
+    data: {}
+    modules:
+      - |
+        package test
+
+        x if {
+          0 = 1
+        }
+    query: data.test.x
+    want_result: "#undefined"

tests/rvm/rego/cases/comprehensions.yaml

@@ -13,3 +13,13 @@ cases:
         main := [(x * 2) | some x in [1, 2, 3]]
     query: data.test.main
     want_result: [2, 4, 6]
+
+  - note: comprehension_equality_failure_returns_empty
+    data: {}
+    modules:
+      - |
+        package test
+
+        z := [x | x := 1; x == 2]
+    query: data.test.z
+    want_result: []