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-rw-r--r-- | compiler/rustc_error_codes/src/error_codes/E0460.md | 71 |
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diff --git a/compiler/rustc_error_codes/src/error_codes/E0460.md b/compiler/rustc_error_codes/src/error_codes/E0460.md new file mode 100644 index 000000000..001678a9b --- /dev/null +++ b/compiler/rustc_error_codes/src/error_codes/E0460.md @@ -0,0 +1,71 @@ +Found possibly newer version of crate `..` which `..` depends on. + +Consider these erroneous files: + +`a1.rs` +```ignore (needs-linkage-with-other-tests) +#![crate_name = "a"] + +pub fn foo<T>() {} +``` + +`a2.rs` +```ignore (needs-linkage-with-other-tests) +#![crate_name = "a"] + +pub fn foo<T>() { + println!("foo<T>()"); +} +``` + +`b.rs` +```ignore (needs-linkage-with-other-tests) +#![crate_name = "b"] + +extern crate a; // linked with `a1.rs` + +pub fn foo() { + a::foo::<isize>(); +} +``` + +`main.rs` +```ignore (needs-linkage-with-other-tests) +extern crate a; // linked with `a2.rs` +extern crate b; // error: found possibly newer version of crate `a` which `b` + // depends on + +fn main() {} +``` + +The dependency graph of this program can be represented as follows: +```text + crate `main` + | + +-------------+ + | | + | v +depends: | crate `b` + `a` v1 | | + | | depends: + | | `a` v2 + v | + crate `a` <------+ +``` + +Crate `main` depends on crate `a` (version 1) and crate `b` which in turn +depends on crate `a` (version 2); this discrepancy in versions cannot be +reconciled. This difference in versions typically occurs when one crate is +compiled and linked, then updated and linked to another crate. The crate +"version" is a SVH (Strict Version Hash) of the crate in an +implementation-specific way. Note that this error can *only* occur when +directly compiling and linking with `rustc`; [Cargo] automatically resolves +dependencies, without using the compiler's own dependency management that +causes this issue. + +This error can be fixed by: + * Using [Cargo], the Rust package manager, automatically fixing this issue. + * Recompiling crate `a` so that both crate `b` and `main` have a uniform + version to depend on. + +[Cargo]: ../cargo/index.html |