rename set method to specify

That's the method name we use when exposing this to users.

components/salsa-2022-macros/src/tracked_fn.rs

@@ -416,7 +416,7 @@ fn specify_fn(
 
                 let (__jar, __runtime) = <_ as salsa::storage::HasJar<#jar_ty>>::jar(#db_var);
                 let __ingredients = <_ as salsa::storage::HasIngredientsFor<#config_ty>>::ingredient(__jar);
-                __ingredients.function.set(#db_var, #(#arg_names,)* #value_arg)
+                __ingredients.function.specify(#db_var, #(#arg_names,)* #value_arg)
             }
         },
     }))

components/salsa-2022-macros/src/tracked_struct.rs

@@ -119,7 +119,7 @@ impl SalsaStruct {
                     let __ingredients = <#jar_ty as salsa::storage::HasIngredientsFor< #ident >>::ingredient(__jar);
                     let __id = __ingredients.#struct_index.new_struct(__runtime, (#(#id_field_names,)*));
                     #(
-                        __ingredients.#value_field_indices.set(__db, __id, #value_field_names);
+                        __ingredients.#value_field_indices.specify(__db, __id, #value_field_names);
                     )*
                     __id
                 }

components/salsa-2022/src/function.rs

@@ -22,7 +22,7 @@ mod inputs;
 mod lru;
 mod maybe_changed_after;
 mod memo;
-mod set;
+mod specify;
 mod store;
 mod sync;
 
@@ -33,7 +33,7 @@ mod sync;
 ///
 /// * the `fetch` method, which is invoked when the function is called by the user's code;
 ///   it will return a memoized value if one exists, or execute the function otherwise.
-/// * the `set` method, which can only be used when the key is an entity created by the active query.
+/// * the `specify` method, which can only be used when the key is an entity created by the active query.
 ///   It sets the value of the function imperatively, so that when later fetches occur, they'll return this value.
 /// * the `store` method, which can only be invoked with an `&mut` reference, and is to set input fields.
 pub struct FunctionIngredient<C: Configuration> {

components/salsa-2022/src/function/specify.rs

@@ -12,7 +12,10 @@ impl<C> FunctionIngredient<C>
 where
     C: Configuration,
 {
-    pub fn set<'db>(&self, db: &'db DynDb<'db, C>, key: C::Key, value: C::Value)
+    /// Specifies the value of the function for the given key.
+    /// This is a way to imperatively set the value of a function.
+    /// It only works if the key is a tracked struct created in the current query.
+    pub fn specify<'db>(&self, db: &'db DynDb<'db, C>, key: C::Key, value: C::Value)
     where
         C::Key: TrackedStructInDb<DynDb<'db, C>>,
     {