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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.
25 lines
780 B
Plaintext
25 lines
780 B
Plaintext
error[E0502]: cannot borrow `vec` as immutable because it is also borrowed as mutable
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--> $DIR/suggest-storing-local-var-for-vector.rs:3:9
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LL | vec[vec.len() - 1] = 123;
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| ----^^^-----------
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| | ||
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| | |immutable borrow occurs here
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| | mutable borrow later used here
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| mutable borrow occurs here
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help: try adding a local storing this...
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--> $DIR/suggest-storing-local-var-for-vector.rs:3:9
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LL | vec[vec.len() - 1] = 123;
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| ^^^^^^^^^
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help: ...and then using that local here
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--> $DIR/suggest-storing-local-var-for-vector.rs:3:8
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LL | vec[vec.len() - 1] = 123;
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| ^^^^^^^^^^^^^^^
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error: aborting due to previous error
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For more information about this error, try `rustc --explain E0502`.
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