[pull] master from ruby:master#166
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pull[bot] merged 1 commit intosysfce2:masterfrom Mar 23, 2026
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When a C file references another source file via `/* in file.c */`, the parser read it with bare `File.read` which uses `Encoding.default_external`. On systems where this is US-ASCII (e.g. Debian CI), non-ASCII bytes in the source file cause `ArgumentError: invalid byte sequence in US-ASCII` in String#scan. Use `RDoc::Encoding.read_file` instead, which reads in binary mode and properly handles encoding detection and transcoding. This was triggered by Ruby commit [`a2531ba293`](ruby/ruby@a2531ba293) which added UTF-8 right arrows (→) in comments in `class.c`, which is referenced from `object.c` via `/* in class.c */`.
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