From 9b6b55753d793e11cbce5a5dcc2c5084dd32ee1e Mon Sep 17 00:00:00 2001
From: acheron <acheroncrypto@gmail.com>
Date: Tue, 14 Jan 2025 18:09:13 +0100
Subject: [PATCH 1/3] idl: Support PDA resolution of call expressions that
 don't have any arguments

---
 lang/syn/src/idl/accounts.rs | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/lang/syn/src/idl/accounts.rs b/lang/syn/src/idl/accounts.rs
index 3d0051ffbf..56d85618bc 100644
--- a/lang/syn/src/idl/accounts.rs
+++ b/lang/syn/src/idl/accounts.rs
@@ -342,6 +342,14 @@ fn parse_seed(seed: &syn::Expr, accounts: &AccountsStruct) -> Result<TokenStream
                 })
             }
         }
+        // Support call expressions that don't have any arguments e.g. `System::id()`
+        syn::Expr::Call(call) if call.args.is_empty() => Ok(quote! {
+            #idl::IdlSeed::Const(
+                #idl::IdlSeedConst {
+                    value: AsRef::<[u8]>::as_ref(&#seed).into(),
+                }
+            )
+        }),
         syn::Expr::Path(path) => {
             let seed = path
                 .path

From 2797df6134349dbbee5cfc5f70d6e11554eb4568 Mon Sep 17 00:00:00 2001
From: acheron <acheroncrypto@gmail.com>
Date: Tue, 14 Jan 2025 20:27:10 +0100
Subject: [PATCH 2/3] tests: Add a test case

---
 .../programs/pda-derivation/src/lib.rs             | 14 ++++++++++++++
 tests/pda-derivation/tests/typescript.spec.ts      |  4 ++++
 2 files changed, 18 insertions(+)

diff --git a/tests/pda-derivation/programs/pda-derivation/src/lib.rs b/tests/pda-derivation/programs/pda-derivation/src/lib.rs
index 5b2a4bd6f5..f2a5352c63 100644
--- a/tests/pda-derivation/programs/pda-derivation/src/lib.rs
+++ b/tests/pda-derivation/programs/pda-derivation/src/lib.rs
@@ -59,6 +59,10 @@ pub mod pda_derivation {
     pub fn unsupported_program_seed(_ctx: Context<UnsupportedProgramSeed>) -> Result<()> {
         Ok(())
     }
+
+    pub fn call_expr_with_no_args(_ctx: Context<CallExprWithNoArgs>) -> Result<()> {
+        Ok(())
+    }
 }
 
 #[derive(Accounts)]
@@ -210,6 +214,16 @@ fn external_function_with_an_argument(pk: &Pubkey) -> Pubkey {
     *pk
 }
 
+#[derive(Accounts)]
+pub struct CallExprWithNoArgs<'info> {
+    #[account(
+        seeds = [System::id().as_ref()],
+        seeds::program = System::id(),
+        bump
+    )]
+    pub pda: UncheckedAccount<'info>,
+}
+
 #[account]
 pub struct MyAccount {
     data: u64,
diff --git a/tests/pda-derivation/tests/typescript.spec.ts b/tests/pda-derivation/tests/typescript.spec.ts
index 8c4059d3e7..203b270b23 100644
--- a/tests/pda-derivation/tests/typescript.spec.ts
+++ b/tests/pda-derivation/tests/typescript.spec.ts
@@ -142,4 +142,8 @@ describe("typescript", () => {
     // @ts-expect-error
     expect(acc.pda).to.be.undefined;
   });
+
+  it("Can resolve call expressions with no arguments", async () => {
+    await program.methods.callExprWithNoArgs().rpc();
+  });
 });

From 536486cfe9646cbd3ceb740448bf52a5f4136212 Mon Sep 17 00:00:00 2001
From: acheron <acheroncrypto@gmail.com>
Date: Thu, 16 Jan 2025 19:59:26 +0100
Subject: [PATCH 3/3] Update CHANGELOG

---
 CHANGELOG.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 16b32cb5e5..6e02b09c9b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -64,6 +64,7 @@ The minor version will be incremented upon a breaking change and the patch versi
 - idl: Disallow account discriminators that can conflict with the `zero` constraint ([#3365](https://github.com/coral-xyz/anchor/pull/3365)).
 - cli: Include recommended solana args by default and add new `--max-retries` option to the `deploy` command ([#3354](https://github.com/coral-xyz/anchor/pull/3354)).
 - avm: Make installation download binaries by default ([#3445](https://github.com/coral-xyz/anchor/pull/3445)).
+- idl: Support PDA resolution of call expressions that don't have any arguments ([#3485](https://github.com/coral-xyz/anchor/pull/3485)).
 
 ### Fixes