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Indexing is similar to method calls in having an arbitrary left-hand-side and then something on the right, which is the main part of the expression. Method calls already have a span for that right part, but indexing does not. This means that long method chains that use indexing have really bad spans, especially when the indexing panics and that span in coverted into a panic location. This does the same thing as method calls for the AST and HIR, storing an extra span which is then put into the `fn_span` field in THIR.
14 lines
509 B
Plaintext
14 lines
509 B
Plaintext
error[E0277]: the type `[{integer}]` cannot be indexed by `i32`
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--> $DIR/index-help.rs:3:7
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LL | x[0i32];
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| ^^^^ slice indices are of type `usize` or ranges of `usize`
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= help: the trait `SliceIndex<[{integer}]>` is not implemented for `i32`
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= help: the trait `SliceIndex<[T]>` is implemented for `usize`
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= note: required for `Vec<{integer}>` to implement `Index<i32>`
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error: aborting due to previous error
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For more information about this error, try `rustc --explain E0277`.
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