E0061: this function takes N arguments but M were supplied Rust Origin: Application & API OSI layer 7 · Application Last updated 5 Nov 2026

Rust: error[E0061]: this function takes 2 arguments but 1 argument was supplied

A call has too few or too many arguments for the function signature.

Exact message you may see error[E0061]: this function takes 2 arguments but 1 argument was suppliedthis method takes 1 argument but 2 arguments were suppliedE0061 this function takes arguments but were suppliederror[E0057]: this function takes 1 argument but 0 arguments were supplied
Explore the map of this error Full error map →
Seen on: Rust

Meaning

Compare with the definition (cargo doc --open or hover). Rust has no default or optional args — pass None or use builder patterns. After a dependency upgrade the signature may have changed; check the changelog. Methods take self implicitly.

Common causes

  • Missing/extra argument
  • Function signature changed after update
  • No default args (expecting Python-like defaults)
  • Passing self explicitly to methods
  • Tuple vs separate args

⚡ Quick fix

  1. Match the signature (use rust-analyzer's parameter hints)
  2. Use Option args or a builder
  3. Read the crate's changelog

Detailed fix by platform

Rust

  1. cargo doc --open to see the exact signature

How to diagnose

  1. Signature — Params?
  2. Update — Changed API?
  3. Default — Needed?

🔧 Still not fixed?

Many errors look alike. If the steps above didn’t solve it, one of these is probably what you’re facing:

Where this error sits

Origin: Application & API. Errors that are often confused with or caused by this one (click to open):

Blocking waiting for file lock on package cache / build directory — Cargo: Blocking waiting for file lock on package cache / on build directory (Rust)Blocking waiting for …cargo: failed to get from registry (spurious network error) — Cargo: warning: spurious network error (2 tries remaining): [35] SSL connect error / error: failed to download from `https://index.crates.io/...` (Rust)cargo: failed to get …cargo: failed to select a version for the requirement — Cargo: error: failed to select a version for the requirement `serde = "^2.0"` — candidate versions found which didn't match: 1.0.197 (Rust)cargo: failed to sele…E0063: missing field in initializer of struct — Rust: error[E0063]: missing field `age` in initializer of `User` (Rust)E0063: missing field …E0277: the trait bound is not satisfied — Rust: error[E0277]: the trait bound `Foo: Display` is not satisfied / `Rc<RefCell<T>>` cannot be sent between threads safely (Rust)E0277: the trait boun…E0308 — Rust: error[E0308]: mismatched types — expected `X`, found `Y` (Rust)E0308E0599: no method named found for type — Rust: error[E0599]: no method named `push_str` found for struct `Vec<String>` in the current scope (Rust)E0599: no method name…feature edition2024 is required / Cargo.lock version too new — Cargo: error: failed to parse manifest — feature `edition2024` is required / lock file version 4 requires `-Znext-lockfile-bump` (Rust)feature edition2024 i…E0061: th…

Explore the map of this error Full error map →

🧠 Still stuck? Analyze your error

Paste the full message, response headers or stack trace — we'll detect the platform and point to the most likely cause.

💬 What worked for others

No tips yet — did something else fix this for you?

Share what worked for you

Tips are checked by an editor before they appear. Links are removed.