Remove the marked_callsites function (#82)

## What Changed?

Removed the `marked_callsites` function and replaced it with
`marked_sinks` and `filter` in the Lemmy property.

## Why Does It Need To?

Function is misleading and just uses `marked_sinks`.

## Checklist

- [x] Above description has been filled out so that upon quash merge we
have a
  good record of what changed.
- [x] New functions, methods, types are documented. Old documentation is
updated
  if necessary
- [x] Documentation in Notion has been updated
- [ ] Tests for new behaviors are provided
  - [ ] New test suites (if any) ave been added to the CI tests (in
`.github/workflows/rust.yml`) either as compiler test or integration
test.
*Or* justification for their omission from CI has been provided in this
PR
    description.

crates/paralegal-policy/src/context.rs

@@ -1,8 +1,8 @@
 use std::{io::Write, process::exit, sync::Arc};
 
 use paralegal_spdg::{
-    Annotation, CallSite, CallSiteOrDataSink, Ctrl, DataSink, DataSource, DefKind, HashMap,
-    HashSet, Identifier, MarkerAnnotation, MarkerRefinement, ProgramDescription,
+    Annotation, CallSiteOrDataSink, Ctrl, DataSink, DataSource, DefKind, HashMap, HashSet,
+    Identifier, MarkerAnnotation, MarkerRefinement, ProgramDescription,
 };
 
 pub use paralegal_spdg::rustc_portable::DefId;
@@ -241,19 +241,6 @@ impl Context {
         })
     }
 
-    /// Returns an iterator over all the call sites marked with `marker` out of the provided `dsts`.
-    pub fn marked_callsites<'a>(
-        &'a self,
-        dsts: impl IntoIterator<Item = &'a DataSink> + 'a,
-        marker: Marker,
-    ) -> impl Iterator<Item = &'a CallSite> + 'a {
-        self.marked_sinks(dsts, marker)
-            .filter_map(|sink| match sink {
-                DataSink::Argument { function, .. } => Some(function),
-                _ => None,
-            })
-    }
-
     /// Returns an iterator over the data sources within controller `c` that have type `t`.
     pub fn srcs_with_type<'a>(
         &self,

props/lemmy/src/main.rs

@@ -6,7 +6,7 @@ use std::sync::Arc;
 
 use paralegal_policy::{
     assert_error,
-    paralegal_spdg::{CallSite, Ctrl, DataSource, Identifier},
+    paralegal_spdg::{CallSite, Ctrl, DataSink, DataSource, Identifier},
     Marker, PolicyContext,
 };
 
@@ -22,7 +22,11 @@ impl CommunityProp {
     fn flow_to_auth(&self, c: &Ctrl, sink: &CallSite, marker: Marker) -> bool {
         let auth_callsites = self
             .cx
-            .marked_callsites(c.data_flow.0.values().flatten(), marker)
+            .marked_sinks(c.data_flow.0.values().flatten(), marker)
+            .filter_map(|sink| match sink {
+                DataSink::Argument { function, .. } => Some(function),
+                _ => None,
+            })
             .collect::<HashSet<_>>();
 
         let mut influence_sink = c.ctrl_flow.0.iter().filter_map(|(src, dsts)| match src {
@@ -40,7 +44,14 @@ impl CommunityProp {
 
         for c in self.cx.desc().controllers.values() {
             for dsts in c.data_flow.0.values() {
-                for write_sink in self.cx.marked_callsites(dsts, db_community_write) {
+                for write_sink in
+                    self.cx
+                        .marked_sinks(dsts, db_community_write)
+                        .filter_map(|sink| match sink {
+                            DataSink::Argument { function, .. } => Some(function),
+                            _ => None,
+                        })
+                {
                     let ok = self.flow_to_auth(c, write_sink, community_delete_check)
                         && self.flow_to_auth(c, write_sink, community_ban_check);
                     assert_error!(self.cx, !ok, "Found a failure!");