diff options
| -rw-r--r-- | src/librustc_resolve/diagnostics.rs | 53 | ||||
| -rw-r--r-- | src/librustc_resolve/lib.rs | 2 | ||||
| -rw-r--r-- | src/test/compile-fail/E0659.rs | 26 | ||||
| -rw-r--r-- | src/test/ui/imports/duplicate.stderr | 8 | ||||
| -rw-r--r-- | src/test/ui/imports/macro-paths.stderr | 4 | ||||
| -rw-r--r-- | src/test/ui/imports/macros.stderr | 4 | ||||
| -rw-r--r-- | src/test/ui/imports/shadow_builtin_macros.stderr | 6 |
7 files changed, 91 insertions, 12 deletions
diff --git a/src/librustc_resolve/diagnostics.rs b/src/librustc_resolve/diagnostics.rs index 564626ac398..b181a2568b4 100644 --- a/src/librustc_resolve/diagnostics.rs +++ b/src/librustc_resolve/diagnostics.rs @@ -1621,6 +1621,59 @@ println!("const value: {}", SomeModule::PRIVATE); // ok! ``` "##, +E0659: r##" +An item usage is ambiguous. + +Erroneous code example: + +```compile_fail,E0659 +pub mod moon { + pub fn foo() {} +} + +pub mod earth { + pub fn foo() {} +} + +mod collider { + pub use moon::*; + pub use earth::*; +} + +fn main() { + collider::foo(); // ERROR: `foo` is ambiguous +} +``` + +This error generally appears when two items with the same name are imported into +a module. Here, the `foo` functions are imported and reexported from the +`collider` module and therefore, when we're using `collider::foo()`, both +functions collide. + +To solve this error, the best solution is generally to keep the path before the +item when using it. Example: + +``` +pub mod moon { + pub fn foo() {} +} + +pub mod earth { + pub fn foo() {} +} + +mod collider { + pub use moon; + pub use earth; +} + +fn main() { + collider::moon::foo(); // ok! + collider::earth::foo(); // ok! +} +``` +"##, + } register_diagnostics! { diff --git a/src/librustc_resolve/lib.rs b/src/librustc_resolve/lib.rs index 0a29441cef7..aaddd3f5c72 100644 --- a/src/librustc_resolve/lib.rs +++ b/src/librustc_resolve/lib.rs @@ -3783,7 +3783,7 @@ impl<'a> Resolver<'a> { self.session.buffer_lint(lint::builtin::LEGACY_IMPORTS, id, span, &msg); } else { let mut err = - self.session.struct_span_err(span, &format!("`{}` is ambiguous", name)); + struct_span_err!(self.session, span, E0659, "`{}` is ambiguous", name); err.span_note(b1.span, &msg1); match b2.def() { Def::Macro(..) if b2.span == DUMMY_SP => diff --git a/src/test/compile-fail/E0659.rs b/src/test/compile-fail/E0659.rs new file mode 100644 index 00000000000..4bd452b0aac --- /dev/null +++ b/src/test/compile-fail/E0659.rs @@ -0,0 +1,26 @@ +// Copyright 2018 The Rust Project Developers. See the COPYRIGHT +// file at the top-level directory of this distribution and at +// http://rust-lang.org/COPYRIGHT. +// +// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or +// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license +// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your +// option. This file may not be copied, modified, or distributed +// except according to those terms. + +mod moon { + pub fn foo() {} +} + +mod earth { + pub fn foo() {} +} + +mod collider { + pub use moon::*; + pub use earth::*; +} + +fn main() { + collider::foo(); //~ ERROR E0659 +} diff --git a/src/test/ui/imports/duplicate.stderr b/src/test/ui/imports/duplicate.stderr index 30f2f517115..a74401314a1 100644 --- a/src/test/ui/imports/duplicate.stderr +++ b/src/test/ui/imports/duplicate.stderr @@ -12,7 +12,7 @@ help: You can use `as` to change the binding name of the import 25 | use a::foo as Otherfoo; //~ ERROR the name `foo` is defined multiple times | ^^^^^^^^^^^^^^^^^^ -error: `foo` is ambiguous +error[E0659]: `foo` is ambiguous --> $DIR/duplicate.rs:56:9 | 56 | use self::foo::bar; //~ ERROR `foo` is ambiguous @@ -30,7 +30,7 @@ note: `foo` could also refer to the name imported here | ^^^^^^^^^^^ = note: consider adding an explicit import of `foo` to disambiguate -error: `foo` is ambiguous +error[E0659]: `foo` is ambiguous --> $DIR/duplicate.rs:45:5 | 45 | f::foo(); //~ ERROR `foo` is ambiguous @@ -48,7 +48,7 @@ note: `foo` could also refer to the name imported here | ^^^^ = note: consider adding an explicit import of `foo` to disambiguate -error: `foo` is ambiguous +error[E0659]: `foo` is ambiguous --> $DIR/duplicate.rs:46:5 | 46 | g::foo(); //~ ERROR `foo` is ambiguous @@ -66,7 +66,7 @@ note: `foo` could also refer to the name imported here | ^^^^ = note: consider adding an explicit import of `foo` to disambiguate -error: `foo` is ambiguous +error[E0659]: `foo` is ambiguous --> $DIR/duplicate.rs:59:9 | 59 | foo::bar(); //~ ERROR `foo` is ambiguous diff --git a/src/test/ui/imports/macro-paths.stderr b/src/test/ui/imports/macro-paths.stderr index 91b0b9756da..32d78666004 100644 --- a/src/test/ui/imports/macro-paths.stderr +++ b/src/test/ui/imports/macro-paths.stderr @@ -1,4 +1,4 @@ -error: `bar` is ambiguous +error[E0659]: `bar` is ambiguous --> $DIR/macro-paths.rs:25:5 | 25 | bar::m! { //~ ERROR ambiguous @@ -16,7 +16,7 @@ note: `bar` could also refer to the name imported here | ^^^^^^ = note: macro-expanded items do not shadow when used in a macro invocation path -error: `baz` is ambiguous +error[E0659]: `baz` is ambiguous --> $DIR/macro-paths.rs:35:5 | 35 | baz::m! { //~ ERROR ambiguous diff --git a/src/test/ui/imports/macros.stderr b/src/test/ui/imports/macros.stderr index 0b67613eb14..75294f7bf12 100644 --- a/src/test/ui/imports/macros.stderr +++ b/src/test/ui/imports/macros.stderr @@ -15,7 +15,7 @@ note: `m` could also refer to the macro imported here 49 | use two_macros::m; | ^^^^^^^^^^^^^ -error: `m` is ambiguous +error[E0659]: `m` is ambiguous --> $DIR/macros.rs:28:5 | 28 | m! { //~ ERROR ambiguous @@ -33,7 +33,7 @@ note: `m` could also refer to the name imported here | ^^^^^^^^^^^^^ = note: macro-expanded macro imports do not shadow -error: `m` is ambiguous +error[E0659]: `m` is ambiguous --> $DIR/macros.rs:41:9 | 41 | m! { //~ ERROR ambiguous diff --git a/src/test/ui/imports/shadow_builtin_macros.stderr b/src/test/ui/imports/shadow_builtin_macros.stderr index 853ed98c30d..8f4325fa12c 100644 --- a/src/test/ui/imports/shadow_builtin_macros.stderr +++ b/src/test/ui/imports/shadow_builtin_macros.stderr @@ -9,7 +9,7 @@ error: `panic` is already in scope | = note: macro-expanded `macro_rules!`s may not shadow existing macros (see RFC 1560) -error: `panic` is ambiguous +error[E0659]: `panic` is ambiguous --> $DIR/shadow_builtin_macros.rs:27:14 | 27 | fn f() { panic!(); } //~ ERROR ambiguous @@ -23,7 +23,7 @@ note: `panic` could refer to the name imported here = note: `panic` is also a builtin macro = note: consider adding an explicit import of `panic` to disambiguate -error: `panic` is ambiguous +error[E0659]: `panic` is ambiguous --> $DIR/shadow_builtin_macros.rs:32:14 | 32 | fn f() { panic!(); } //~ ERROR ambiguous @@ -37,7 +37,7 @@ note: `panic` could refer to the name imported here = note: `panic` is also a builtin macro = note: macro-expanded macro imports do not shadow -error: `n` is ambiguous +error[E0659]: `n` is ambiguous --> $DIR/shadow_builtin_macros.rs:61:5 | 61 | n!(); //~ ERROR ambiguous |