diff options
| -rw-r--r-- | src/librustc_typeck/diagnostics.rs | 215 |
1 files changed, 174 insertions, 41 deletions
diff --git a/src/librustc_typeck/diagnostics.rs b/src/librustc_typeck/diagnostics.rs index 0223079b8bf..0dbfffe5c64 100644 --- a/src/librustc_typeck/diagnostics.rs +++ b/src/librustc_typeck/diagnostics.rs @@ -73,10 +73,39 @@ the enum. "##, E0025: r##" -Each field of a struct can only be bound once in a pattern. Each occurrence of a -field name binds the value of that field, so to fix this error you will have to -remove or alter the duplicate uses of the field name. Perhaps you misspelt -another field name? +Each field of a struct can only be bound once in a pattern. Erroneous code +example: + +``` +struct Foo { + a: u8, + b: u8, +} + +fn main(){ + let x = Foo { a:1, b:2 }; + + let Foo { a: x, a: y } = x; + // error: field `a` bound multiple times in the pattern +} +``` + +Each occurrence of a field name binds the value of that field, so to fix this +error you will have to remove or alter the duplicate uses of the field name. +Perhaps you misspelled another field name? Example: + +``` +struct Foo { + a: u8, + b: u8, +} + +fn main(){ + let x = Foo { a:1, b:2 }; + + let Foo { a: x, b: y } = x; // ok! +} +``` "##, E0026: r##" @@ -401,10 +430,35 @@ extern "C" { "##, E0046: r##" +Items are missing in a trait implementation. Erroneous code example: + +``` +trait Foo { + fn foo(); +} + +struct Bar; + +impl Foo for Bar {} +// error: not all trait items implemented, missing: `foo` +``` + When trying to make some type implement a trait `Foo`, you must, at minimum, provide implementations for all of `Foo`'s required methods (meaning the methods that do not have default implementations), as well as any required -trait items like associated types or constants. +trait items like associated types or constants. Example: + +``` +trait Foo { + fn foo(); +} + +struct Bar; + +impl Foo for Bar { + fn foo() {} // ok! +} +``` "##, E0049: r##" @@ -615,14 +669,62 @@ variadic functions (except for its C-FFI). E0062: r##" This error indicates that during an attempt to build a struct or struct-like -enum variant, one of the fields was specified more than once. Each field should -be specified exactly one time. +enum variant, one of the fields was specified more than once. Erroneous code +example: + +``` +struct Foo { + x: i32 +} + +fn main() { + let x = Foo { + x: 0, + x: 0, // error: field `x` specified more than once + }; +} +``` + +Each field should be specified exactly one time. Example: + +``` +struct Foo { + x: i32 +} + +fn main() { + let x = Foo { x: 0 }; // ok! +} +``` "##, E0063: r##" This error indicates that during an attempt to build a struct or struct-like -enum variant, one of the fields was not provided. Each field should be -specified exactly once. +enum variant, one of the fields was not provided. Erroneous code example: + +``` +struct Foo { + x: i32, + y: i32 +} + +fn main() { + let x = Foo { x: 0 }; // error: missing field: `y` +} +``` + +Each field should be specified exactly once. Example: + +``` +struct Foo { + x: i32, + y: i32 +} + +fn main() { + let x = Foo { x: 0, y: 0 }; // ok! +} +``` "##, E0066: r##" @@ -1025,7 +1127,7 @@ fn main() { } ``` -The number of supplied parameters much exactly match the number of defined type +The number of supplied parameters must exactly match the number of defined type parameters. "##, @@ -1620,6 +1722,12 @@ extern { E0131: r##" It is not possible to define `main` with type parameters, or even with function parameters. When `main` is present, it must take no arguments and return `()`. +Erroneous code example: + +``` +fn main<T>() { // error: main function is not allowed to have type parameters +} +``` "##, E0132: r##" @@ -1627,7 +1735,7 @@ It is not possible to declare type parameters on a function that has the `start` attribute. Such a function must have the following type signature: ``` -fn(isize, *const *const u8) -> isize +fn(isize, *const *const u8) -> isize; ``` "##, @@ -1779,7 +1887,7 @@ rfcs/blob/master/text/0019-opt-in-builtin-traits.md). E0193: r##" `where` clauses must use generic type parameters: it does not make sense to use -them otherwise. An example causing this error: +them otherwise. An example causing this error: ``` trait Foo { @@ -1881,7 +1989,6 @@ unsafe impl Foo { } // converting it to this will fix it impl Foo { } ``` - "##, E0198: r##" @@ -1898,7 +2005,6 @@ unsafe impl !Clone for Foo { } // this will compile impl !Clone for Foo { } ``` - "##, E0199: r##" @@ -1916,7 +2022,6 @@ unsafe impl Bar for Foo { } // this will compile impl Bar for Foo { } ``` - "##, E0200: r##" @@ -1934,7 +2039,6 @@ impl Bar for Foo { } // this will compile unsafe impl Bar for Foo { } ``` - "##, E0201: r##" @@ -2717,6 +2821,36 @@ It is also possible to overload most operators for your own type by implementing traits from `std::ops`. "##, +E0370: r##" +The maximum value of an enum was reached, so it cannot be automatically +set in the next enum value. Erroneous code example: + +``` +enum Foo { + X = 0x7fffffffffffffff, + Y // error: enum discriminant overflowed on value after + // 9223372036854775807: i64; set explicitly via + // Y = -9223372036854775808 if that is desired outcome +} +``` + +To fix this, please set manually the next enum value or put the enum variant +with the maximum value at the end of the enum. Examples: + +``` +enum Foo { + X = 0x7fffffffffffffff, + Y = 0, // ok! +} + +// or: +enum Foo { + Y = 0, // ok! + X = 0x7fffffffffffffff, +} +``` +"##, + E0371: r##" When `Trait2` is a subtrait of `Trait1` (for example, when `Trait2` has a definition like `trait Trait2: Trait1 { ... }`), it is not allowed to implement @@ -2869,44 +3003,44 @@ https://doc.rust-lang.org/std/marker/struct.PhantomData.html } register_diagnostics! { - E0068, - E0085, - E0086, +// E0068, +// E0085, +// E0086, E0090, E0103, // @GuillaumeGomez: I was unable to get this error, try your best! E0104, E0118, E0122, - E0123, - E0127, - E0129, - E0141, +// E0123, +// E0127, +// E0129, +// E0141, // E0159, // use of trait `{}` as struct constructor E0163, E0164, E0167, // E0168, - E0173, // manual implementations of unboxed closure traits are experimental +// E0173, // manual implementations of unboxed closure traits are experimental E0174, // explicit use of unboxed closure methods are experimental E0182, E0183, - E0187, // can't infer the kind of the closure - E0188, // can not cast a immutable reference to a mutable pointer - E0189, // deprecated: can only cast a boxed pointer to a boxed object - E0190, // deprecated: can only cast a &-pointer to an &-object +// E0187, // can't infer the kind of the closure +// E0188, // can not cast a immutable reference to a mutable pointer +// E0189, // deprecated: can only cast a boxed pointer to a boxed object +// E0190, // deprecated: can only cast a &-pointer to an &-object E0196, // cannot determine a type for this closure E0203, // type parameter has more than one relaxed default bound, // and only one is supported E0208, - E0209, // builtin traits can only be implemented on structs or enums +// E0209, // builtin traits can only be implemented on structs or enums E0212, // cannot extract an associated type from a higher-ranked trait bound - E0213, // associated types are not accepted in this context +// E0213, // associated types are not accepted in this context E0214, // parenthesized parameters may only be used with a trait // E0215, // angle-bracket notation is not stable with `Fn` // E0216, // parenthetical notation is only stable with `Fn` - E0217, // ambiguous associated type, defined in multiple supertraits - E0218, // no associated type defined - E0219, // associated type defined in higher-ranked supertrait +// E0217, // ambiguous associated type, defined in multiple supertraits +// E0218, // no associated type defined +// E0219, // associated type defined in higher-ranked supertrait // E0222, // Error code E0045 (variadic function must have C calling // convention) duplicate E0224, // at least one non-builtin train is required for an object type @@ -2916,25 +3050,24 @@ register_diagnostics! { E0229, // associated type bindings are not allowed here E0230, // there is no type parameter on trait E0231, // only named substitution parameters are allowed - E0233, - E0234, +// E0233, +// E0234, // E0235, // structure constructor specifies a structure of type but E0236, // no lang item for range syntax E0237, // no lang item for range syntax E0238, // parenthesized parameters may only be used with a trait - E0239, // `next` method of `Iterator` trait has unexpected type - E0240, - E0241, +// E0239, // `next` method of `Iterator` trait has unexpected type +// E0240, +// E0241, E0242, // internal error looking up a definition E0245, // not a trait - E0246, // invalid recursive type +// E0246, // invalid recursive type E0247, // found module name used as a type - E0319, // trait impls for defaulted traits allowed just for structs/enums +// E0319, // trait impls for defaulted traits allowed just for structs/enums E0320, // recursive overflow during dropck E0321, // extended coherence rules for defaulted traits violated E0328, // cannot implement Unsize explicitly E0329, // associated const depends on type parameter or Self. - E0370, // discriminant overflow E0374, // the trait `CoerceUnsized` may only be implemented for a coercion // between structures with one field being coerced, none found E0375, // the trait `CoerceUnsized` may only be implemented for a coercion |