Added option to allow conflicting paths.

crates/cairo-lang-starknet/src/analyzer.rs

@@ -22,6 +22,7 @@ use crate::plugin::consts::{
 use crate::plugin::utils::has_derive;
 
 const ALLOW_NO_DEFAULT_VARIANT_ATTR: &str = "starknet::store_no_default_variant";
+const ALLOW_COLLIDING_PATHS_ATTR: &str = "starknet::colliding_storage_paths";
 
 /// Plugin to add diagnostics for contracts for bad ABI generation.
 #[derive(Default, Debug)]
@@ -123,7 +124,7 @@ impl AnalyzerPlugin for StorageAnalyzer {
     }
 
     fn declared_allows(&self) -> Vec<String> {
-        vec![ALLOW_NO_DEFAULT_VARIANT_ATTR.to_string()]
+        vec![ALLOW_NO_DEFAULT_VARIANT_ATTR.to_string(), ALLOW_COLLIDING_PATHS_ATTR.to_string()]
     }
 }
 
@@ -135,11 +136,21 @@ fn add_storage_struct_diags(
     id: StructId,
     diagnostics: &mut Vec<PluginDiagnostic>,
 ) {
-    let paths_data = &mut StorageStructMembers { name_to_paths: OrderedHashMap::default() };
+    if id.has_attr_with_arg(db, "allow", ALLOW_COLLIDING_PATHS_ATTR) == Ok(true) {
+        return;
+    }
     let Ok(members) = db.struct_members(id) else {
         return;
     };
+    let paths_data = &mut StorageStructMembers { name_to_paths: OrderedHashMap::default() };
     for (member_name, member) in members.iter() {
+        if member.id.stable_ptr(db.upcast()).lookup(db.upcast()).has_attr_with_arg(
+            db.upcast(),
+            "allow",
+            ALLOW_COLLIDING_PATHS_ATTR,
+        ) {
+            continue;
+        }
         member_analyze(
             db,
             member,
@@ -176,7 +187,8 @@ impl StorageStructMembers {
             diagnostics.push(PluginDiagnostic::warning(
                 pointer_to_code,
                 format!(
-                    "The path `{}` collides with existing path `{}`.",
+                    "The path `{}` collides with existing path `{}`. Fix or add \
+                     `#[allow({ALLOW_COLLIDING_PATHS_ATTR})]` if intentional.",
                     path_to_member.join("."),
                     existing_path.join(".")
                 ),

crates/cairo-lang-starknet/src/plugin/plugin_test_data/contracts/with_component

@@ -1081,7 +1081,7 @@ impl StorageStorageBaseMutDrop of core::traits::Drop::<StorageStorageBaseMut>;
 impl StorageStorageBaseMutCopy of core::traits::Copy::<StorageStorageBaseMut>;
 
 //! > expected_diagnostics
-warning: Plugin diagnostic: The path `component2_storage.data` collides with existing path `component1_storage.data`.
+warning: Plugin diagnostic: The path `component2_storage.data` collides with existing path `component1_storage.data`. Fix or add `#[allow(starknet::colliding_storage_paths)]` if intentional.
  --> lib.cairo:26:9
         component2_storage: super::component2::Storage,
         ^****************^
@@ -1136,7 +1136,7 @@ mod test_contract {
 }
 
 //! > expected_diagnostics
-warning: Plugin diagnostic: The path `component2_storage.data` collides with existing path `component1_storage.data`.
+warning: Plugin diagnostic: The path `component2_storage.data` collides with existing path `component1_storage.data`. Fix or add `#[allow(starknet::colliding_storage_paths)]` if intentional.
  --> lib.cairo:26:9
         component2_storage: super::component2::Storage,
         ^****************^

crates/cairo-lang-starknet/src/plugin/plugin_test_data/contracts/with_component_diagnostics

@@ -3601,7 +3601,7 @@ Note: currently with components, only an enum Event directly in the contract is
     component!(path: super::component2, storage: component2_storage, event: Comp2Event);
                                                                             ^********^
 
-warning: Plugin diagnostic: The path `component2_storage.data` collides with existing path `component1_storage.data`.
+warning: Plugin diagnostic: The path `component2_storage.data` collides with existing path `component1_storage.data`. Fix or add `#[allow(starknet::colliding_storage_paths)]` if intentional.
  --> lib.cairo:27:9
         component2_storage: super::component2::Storage,
         ^****************^

crates/cairo-lang-starknet/src/test_data/storage_path_check

@@ -26,12 +26,12 @@ struct Storage {
 //! > expected_diagnostics
 
 //! > diagnostics
-warning: Plugin diagnostic: The path `has_a.a` collides with existing path `a`.
+warning: Plugin diagnostic: The path `has_a.a` collides with existing path `a`. Fix or add `#[allow(starknet::colliding_storage_paths)]` if intentional.
  --> lib.cairo:10:5
     has_a: HasA,
     ^***^
 
-warning: Plugin diagnostic: The path `has_a.a` collides with existing path `a`.
+warning: Plugin diagnostic: The path `has_a.a` collides with existing path `a`. Fix or add `#[allow(starknet::colliding_storage_paths)]` if intentional.
  --> lib.cairo:17:9
     pub has_a: HasA,
         ^***^
@@ -75,7 +75,7 @@ mod contract_with_and_without_ignored {
 //! > expected_diagnostics
 
 //! > diagnostics
-warning: Plugin diagnostic: The path `y.member0` collides with existing path `x.ignored_member.member0`.
+warning: Plugin diagnostic: The path `y.member0` collides with existing path `x.ignored_member.member0`. Fix or add `#[allow(starknet::colliding_storage_paths)]` if intentional.
  --> lib.cairo:25:13
         pub y: Struct0,
             ^
@@ -115,12 +115,12 @@ mod component_with_and_without_ignored {
 //! > expected_diagnostics
 
 //! > diagnostics
-warning: Plugin diagnostic: The path `has_a.a` collides with existing path `a`.
+warning: Plugin diagnostic: The path `has_a.a` collides with existing path `a`. Fix or add `#[allow(starknet::colliding_storage_paths)]` if intentional.
  --> lib.cairo:19:13
         pub has_a: HasA,
             ^***^
 
-warning: Plugin diagnostic: The path `has_has_a.has_a.a` collides with existing path `a`.
+warning: Plugin diagnostic: The path `has_has_a.has_a.a` collides with existing path `a`. Fix or add `#[allow(starknet::colliding_storage_paths)]` if intentional.
  --> lib.cairo:21:13
         pub has_has_a: HasHasA,
             ^*******^
@@ -174,12 +174,54 @@ mod contract_with_component {
 //! > expected_diagnostics
 
 //! > diagnostics
-warning: Plugin diagnostic: The path `y.ignored_member.member0` collides with existing path `x.member0`.
+warning: Plugin diagnostic: The path `y.ignored_member.member0` collides with existing path `x.member0`. Fix or add `#[allow(starknet::colliding_storage_paths)]` if intentional.
  --> lib.cairo:25:13
         pub y: IgnoredMemberStruct,
             ^
 
-warning: Plugin diagnostic: The path `member.y.ignored_member.member0` collides with existing path `member.x.member0`.
+warning: Plugin diagnostic: The path `member.y.ignored_member.member0` collides with existing path `member.x.member0`. Fix or add `#[allow(starknet::colliding_storage_paths)]` if intentional.
  --> lib.cairo:35:9
         member: component::Storage,
         ^****^
+
+//! > ==========================================================================
+
+//! > Test ignored colliding paths check.
+
+//! > test_runner_name
+test_storage_path_check(expect_diagnostics: false)
+
+//! > cairo_code
+#[starknet::storage_node]
+struct SingleMember {
+    pub value: felt252,
+}
+
+#[starknet::storage_node]
+struct IgnoredCollision1 {
+    #[flat]
+    #[allow(starknet::colliding_storage_paths)]
+    pub a: SingleMember,
+    #[flat]
+    pub b: SingleMember,
+}
+
+#[starknet::storage_node]
+struct IgnoredCollision2 {
+    #[flat]
+    pub a: SingleMember,
+    #[flat]
+    #[allow(starknet::colliding_storage_paths)]
+    pub b: SingleMember,
+}
+
+#[starknet::storage_node]
+#[allow(starknet::colliding_storage_paths)]
+struct IgnoredCollision3 {
+    #[flat]
+    pub a: SingleMember,
+    #[flat]
+    pub b: SingleMember,
+}
+
+//! > diagnostics