compiling sqlx-core v0.5.13 failed

[zzhaolei]

detail:

   Compiling sqlx-core v0.5.13
error[E0107]: this struct takes 3 generic arguments but 2 generic arguments were supplied
  --> /Users/zhaolei/.cargo/registry/src/rsproxy.cn-8f6827c7555bfaf8/sqlx-core-0.5.13/src/sqlite/options/mod.rs:66:25
   |
66 |     pub(crate) pragmas: IndexMap<Cow<'static, str>, Cow<'static, str>>,
   |                         ^^^^^^^^ -----------------  ----------------- supplied 2 generic arguments
   |                         |
   |                         expected 3 generic arguments
   |
note: struct defined here, with 3 generic parameters: `K`, `V`, `S`
  --> /Users/zhaolei/.cargo/registry/src/rsproxy.cn-8f6827c7555bfaf8/indexmap-1.9.1/src/map.rs:76:12
   |
76 | pub struct IndexMap<K, V, S> {
   |            ^^^^^^^^ -  -  -
help: add missing generic argument
   |
66 |     pub(crate) pragmas: IndexMap<Cow<'static, str>, Cow<'static, str>, S>,
   |                                                                      +++

For more information about this error, try `rustc --explain E0107`.
error: could not compile `sqlx-core` due to previous error
warning: build failed, waiting for other jobs to finish...
error: could not compile `sqlx-core` due to previous error

[abonander]

You're somehow forcing the std feature of indexmap off or building with #![no_std], which SQLx does not currently support.

The third generic parameter of IndexMap has a default if std support is enabled: https://github.com/bluss/indexmap/blob/1.9.1/src/map.rs#L71

[zzhaolei]

no, i not using no_std, problems when I use sea-orm crate

Cargo.toml:

sea-orm = { version = "0.8", features = [
    "sqlx-sqlite",
    "runtime-tokio-rustls",
    "macros",
    "debug-print",
    "mock",
] }

[zzhaolei]

It can compile on another computer. I don't understand why, but now everything is normal🤔

[abonander]

It's also possible that indexmap's automatic detection of std is faulty. It appears to try to compile extern crate std as probe; and checks if that succeeds, but that can fail for a number of other reasons.

It appears they've abandoned that approach on master and just rely on a default-on std feature instead.