Add E0613
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@ -3063,8 +3063,8 @@ impl<'a, 'gcx, 'tcx> FnCtxt<'a, 'gcx, 'tcx> {
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idx.node, expr_t).emit();
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} else {
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type_error_struct!(self.tcx().sess, expr.span, expr_t, E0613,
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"attempted tuple index `{}` on type `{}`, but the type was not a \
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tuple or tuple struct",
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"attempted to access tuple index `{}` on type `{}`, but the type \
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was not a tuple or tuple struct",
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idx.node, expr_t).emit();
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}
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@ -4238,7 +4238,51 @@ Attempted tuple index on a type which isn't a tuple nor a tuple-struct.
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Erroneous code example:
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```compile_fail,E0613
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struct Foo;
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let y = Foo;
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println!("{}", y.1); // error: attempted to access tuple index `1` on type
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// `Foo`, but the type was not a tuple or tuple
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// struct
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```
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Only tuple and tuple-struct types can be indexed this way. Example:
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```
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// Let's create a tuple first:
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let x: (u32, u32, u32, u32) = (0, 1, 1, 2);
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// You can index its fields this way:
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println!("({}, {}, {}, {})", x.0, x.1, x.2, x.3);
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// Now let's declare a tuple-struct:
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struct TupleStruct(u32, u32, u32, u32);
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// Let's instantiate it:
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let x = TupleStruct(0, 1, 1, 2);
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// And just like the tuple:
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println!("({}, {}, {}, {})", x.0, x.1, x.2, x.3);
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```
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If you want to index into an array, use `[]` instead:
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```
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let x = &[0, 1, 1, 2];
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println!("[{}, {}, {}, {}]", x[0], x[1], x[2], x[3]);
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```
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If you want to access a field of a struct, check the field's name wasn't
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misspelled:
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```
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struct SomeStruct {
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x: u32,
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y: i32,
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}
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let s = SomeStruct {
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x: 0,
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y: -1,
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};
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println!("x: {} y: {}", s.x, s.y);
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```
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"##,
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16
src/test/compile-fail/E0613.rs
Normal file
16
src/test/compile-fail/E0613.rs
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@ -0,0 +1,16 @@
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// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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struct Foo;
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fn main() {
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let y = Foo;
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y.1; //~ ERROR E0613
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}
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@ -14,7 +14,7 @@ struct Empty;
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fn main() {
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let origin = Point { x: 0, y: 0 };
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origin.0;
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//~^ ERROR attempted tuple index `0` on type `Point`, but the type was not
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//~^ ERROR attempted to access tuple index `0` on type `Point`, but the type was not
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Empty.0;
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//~^ ERROR attempted tuple index `0` on type `Empty`, but the type was not
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//~^ ERROR attempted to access tuple index `0` on type `Empty`, but the type was not
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}
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@ -16,7 +16,7 @@ error[E0610]: `{integer}` is a primitive type and therefore doesn't have fields
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51 | fake_field_stmt!();
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| ------------------- in this macro invocation
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error[E0613]: attempted tuple index `0` on type `{integer}`, but the type was not a tuple or tuple struct
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error[E0613]: attempted to access tuple index `0` on type `{integer}`, but the type was not a tuple or tuple struct
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--> $DIR/macro-backtrace-invalid-internals.rs:27:11
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27 | (1).0
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@ -43,7 +43,7 @@ error[E0610]: `{integer}` is a primitive type and therefore doesn't have fields
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55 | let _ = fake_field_expr!();
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| ------------------ in this macro invocation
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error[E0613]: attempted tuple index `0` on type `{integer}`, but the type was not a tuple or tuple struct
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error[E0613]: attempted to access tuple index `0` on type `{integer}`, but the type was not a tuple or tuple struct
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--> $DIR/macro-backtrace-invalid-internals.rs:45:11
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45 | (1).0
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