const-eval.const-expr.field: make paragraph more clear #2157
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Yea a little confusing, I think the original text is poorly worded. I think what it is trying to say is that you can use an index expression as long as you are only indexing an array or slice type with a usize. Should probably check if that is still correct, or if it has been relaxed at all since it was written in 2017 (#13). |
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Am not sure how to check if the restriction is lifted, but when I try other types, I get this in the compile error...
And, in const context, ranges are not accepted as index type. |
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Feb 10, 2026
Update books ## rust-lang/book 1 commits in 39aeceaa3aeab845bc4517e7a44e48727d3b9dbe..05d114287b7d6f6c9253d5242540f00fbd6172ab 2026-02-03 15:19:04 UTC to 2026-02-03 15:19:04 UTC - Temporarily remove the link to `Drop::drop` (rust-lang/book#4576) ## rust-lang/nomicon 1 commits in 050c002a360fa45b701ea34feed7a860dc8a41bf..b8f254a991b8b7e8f704527f0d4f343a4697dfa9 2026-01-29 12:15:01 UTC to 2026-01-29 12:15:01 UTC - Fix deprecation warning for compare_and_swap in atomics.md (rust-lang/nomicon#519) ## rust-lang/reference 12 commits in 990819b86c22bbf538c0526f0287670f3dc1a67a..addd0602c819b6526b9cc97653b0fadca395528c 2026-02-04 14:35:59 UTC to 2026-01-26 18:02:14 UTC - const-eval.const-expr.field: make paragraph more clear (rust-lang/reference#2157) - make more clear what the link target is (rust-lang/reference#2156) - Update two URLs (rust-lang/reference#2154) - Add a chapter on divergence (rust-lang/reference#2067) - Guarantee `repr(C)` union field offset (rust-lang/reference#2128) - Reference updates for forbidding object lifetime changing pointer casts (rust-lang/reference#1951) - Clarify only arrays undergo unsized coercion during dispatch (rust-lang/reference#2139) - Split the textual chapter into separate char and str chapters (rust-lang/reference#2145) - Document ppc inline asm support (rust-lang/reference#2056) - Unwrap items, expressions, patterns, and types (rust-lang/reference#2141) - undefined behavior: add missing plural in `undefined.misaligned.ptr` (rust-lang/reference#2146) - inline-assembly: add a space to the `asm.abi-clobbers.many` example (rust-lang/reference#2144)
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Update books ## rust-lang/book 1 commits in 39aeceaa3aeab845bc4517e7a44e48727d3b9dbe..05d114287b7d6f6c9253d5242540f00fbd6172ab 2026-02-03 15:19:04 UTC to 2026-02-03 15:19:04 UTC - Temporarily remove the link to `Drop::drop` (rust-lang/book#4576) ## rust-lang/nomicon 1 commits in 050c002a360fa45b701ea34feed7a860dc8a41bf..b8f254a991b8b7e8f704527f0d4f343a4697dfa9 2026-01-29 12:15:01 UTC to 2026-01-29 12:15:01 UTC - Fix deprecation warning for compare_and_swap in atomics.md (rust-lang/nomicon#519) ## rust-lang/reference 12 commits in 990819b86c22bbf538c0526f0287670f3dc1a67a..addd0602c819b6526b9cc97653b0fadca395528c 2026-02-04 14:35:59 UTC to 2026-01-26 18:02:14 UTC - const-eval.const-expr.field: make paragraph more clear (rust-lang/reference#2157) - make more clear what the link target is (rust-lang/reference#2156) - Update two URLs (rust-lang/reference#2154) - Add a chapter on divergence (rust-lang/reference#2067) - Guarantee `repr(C)` union field offset (rust-lang/reference#2128) - Reference updates for forbidding object lifetime changing pointer casts (rust-lang/reference#1951) - Clarify only arrays undergo unsized coercion during dispatch (rust-lang/reference#2139) - Split the textual chapter into separate char and str chapters (rust-lang/reference#2145) - Document ppc inline asm support (rust-lang/reference#2056) - Unwrap items, expressions, patterns, and types (rust-lang/reference#2141) - undefined behavior: add missing plural in `undefined.misaligned.ptr` (rust-lang/reference#2146) - inline-assembly: add a space to the `asm.abi-clobbers.many` example (rust-lang/reference#2144)
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This also makes it more clear that this paragraph is about 3 distinct things
/me am not so sure about this, so this can act as request for clarification