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[GH-ISSUE #774] Unable to compile: this struct takes 3 type arguments but only 2 type arguments were supplied #409

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opened 2026-02-27 19:30:28 +03:00 by kerem · 4 comments

kerem commented

2026-02-27 19:30:28 +03:00

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Originally created by @mathquis on GitHub (May 28, 2021).
Original GitHub issue: https://github.com/librespot-org/librespot/issues/774

OS: Debian (buster)

error[E0107]: this struct takes 3 type arguments but only 2 type arguments were supplied
  --> core/src/cache.rs:18:12
   |
18 |     queue: PriorityQueue<PathBuf, Reverse<SystemTime>>,
   |            ^^^^^^^^^^^^^ -------  ------------------- supplied 2 type arguments
   |            |
   |            expected 3 type arguments
   |
note: struct defined here, with 3 type parameters: `I`, `P`, `H`
  --> /home/user/.cargo/registry/src/github.com-1ecc6299db9ec823/priority-queue-1.1.1/src/pqueue.rs:62:12
   |
62 | pub struct PriorityQueue<I, P, H>
   |            ^^^^^^^^^^^^^ -  -  -
help: add missing type argument
   |
18 |     queue: PriorityQueue<PathBuf, Reverse<SystemTime>, H>,
   |                                                      ^^^

error: aborting due to previous error

Originally created by @mathquis on GitHub (May 28, 2021). Original GitHub issue: https://github.com/librespot-org/librespot/issues/774 OS: Debian (buster) ``` error[E0107]: this struct takes 3 type arguments but only 2 type arguments were supplied --> core/src/cache.rs:18:12 | 18 | queue: PriorityQueue<PathBuf, Reverse<SystemTime>>, | ^^^^^^^^^^^^^ ------- ------------------- supplied 2 type arguments | | | expected 3 type arguments | note: struct defined here, with 3 type parameters: `I`, `P`, `H` --> /home/user/.cargo/registry/src/github.com-1ecc6299db9ec823/priority-queue-1.1.1/src/pqueue.rs:62:12 | 62 | pub struct PriorityQueue<I, P, H> | ^^^^^^^^^^^^^ - - - help: add missing type argument | 18 | queue: PriorityQueue<PathBuf, Reverse<SystemTime>, H>, | ^^^ error: aborting due to previous error ```

kerem

2026-02-27 19:30:28 +03:00

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kerem commented

2026-02-27 19:30:28 +03:00

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@roderickvd commented on GitHub (May 28, 2021):

What is your rustc version? Debian Buster has 1.41 I believe while the minimum supported version is 1.48.

@roderickvd commented on GitHub (May 28, 2021): What is your `rustc` version? Debian Buster has 1.41 I believe while the minimum supported version is 1.48.

kerem commented

2026-02-27 19:30:28 +03:00

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@mathquis commented on GitHub (May 28, 2021):

rustc 1.52.1 (9bc8c42bb 2021-05-09)
cargo 1.52.0 (69767412a 2021-04-21)

Installed with curl https://sh.rustup.rs -sSf | sh

@mathquis commented on GitHub (May 28, 2021): rustc 1.52.1 (9bc8c42bb 2021-05-09) cargo 1.52.0 (69767412a 2021-04-21) Installed with `curl https://sh.rustup.rs -sSf | sh`

kerem commented

2026-02-27 19:30:28 +03:00

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@kingosticks commented on GitHub (May 28, 2021):

isn't this something to do with not using std? That 3 argument version is gated by #[cfg(not(has_std))].

@kingosticks commented on GitHub (May 28, 2021): isn't this something to do with not using `std`? That 3 argument version is gated by `#[cfg(not(has_std))]`.

kerem commented

2026-02-27 19:30:28 +03:00

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@mathquis commented on GitHub (May 28, 2021):

@kingosticks You're right!

sudo apt install libstd-rust-dev solved it.

@mathquis commented on GitHub (May 28, 2021): @kingosticks You're right! `sudo apt install libstd-rust-dev` solved it.

kerem referenced this issue

2026-02-27 20:00:25 +03:00

[PR #409] [MERGED] readme related project rpi-audio-receiver #913

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