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Auto merge of #38066 - bluss:string-slice-error, r=sfackler
Use more specific panic message for &str slicing errors Separate out of bounds errors from character boundary errors, and print more details for character boundary errors. It reports the first error it finds in: 1. begin out of bounds 2. end out of bounds 3. begin <= end violated 3. begin not char boundary 5. end not char boundary. Example: &"abcαβγ"[..4] thread 'str::test_slice_fail_boundary_1' panicked at 'byte index 4 is not a char boundary; it is inside 'α' (bytes 3..5) of `abcαβγ`' Fixes #38052
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