docs/test: add UI test and long-form error docs for E0519
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5 changed files with 60 additions and 3 deletions
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@ -280,6 +280,7 @@ E0515: include_str!("./error_codes/E0515.md"),
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E0516: include_str!("./error_codes/E0516.md"),
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E0517: include_str!("./error_codes/E0517.md"),
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E0518: include_str!("./error_codes/E0518.md"),
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E0519: include_str!("./error_codes/E0519.md"),
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E0520: include_str!("./error_codes/E0520.md"),
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E0521: include_str!("./error_codes/E0521.md"),
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E0522: include_str!("./error_codes/E0522.md"),
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@ -616,7 +617,6 @@ E0791: include_str!("./error_codes/E0791.md"),
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// E0489, // type/lifetime parameter not in scope here
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E0490, // a value of type `..` is borrowed for too long
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E0514, // metadata version mismatch
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E0519, // local crate and dependency have same (crate-name, disambiguator)
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E0523, // two dependencies have same (crate-name, disambiguator) but different SVH
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// E0526, // shuffle indices are not constant
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// E0540, // multiple rustc_deprecated attributes
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40
compiler/rustc_error_codes/src/error_codes/E0519.md
Normal file
40
compiler/rustc_error_codes/src/error_codes/E0519.md
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@ -0,0 +1,40 @@
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The current crate is indistinguishable from one of its dependencies, in terms
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of metadata.
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Example of erroneous code:
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`a.rs`
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```ignore (cannot-link-with-other-tests)
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#![crate_name = "a"]
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#![crate_type = "lib"]
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pub fn foo() {}
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```
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`b.rs`
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```ignore (cannot-link-with-other-tests)
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#![crate_name = "a"]
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#![crate_type = "lib"]
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// error: the current crate is indistinguishable from one of its dependencies:
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// it has the same crate-name `a` and was compiled with the same
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// `-C metadata` arguments. This will result in symbol conflicts between
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// the two.
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extern crate a;
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pub fn foo() {}
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fn bar() {
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a::foo(); // is this calling the local crate or the dependency?
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}
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```
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The above example compiles two crates with exactly the same name and
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`crate_type` (plus any other metadata). This causes an error because it becomes
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impossible for the compiler to distinguish between symbols (`pub` item names).
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This error can be fixed by:
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* Using [Cargo](../cargo/index.html), the Rust package manager, automatically
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fixing this issue.
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* Recompiling the crate with different metadata (different name/
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`crate_type`).
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