docs(ch04-02): clarify reference scope vs variable scope (#4706)#4778
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docs(ch04-02): clarify reference scope vs variable scope (#4706)#4778Dodothereal wants to merge 1 commit into
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Fixes rust-lang#4706: the phrase 'a reference's scope starts from where it is introduced' implicitly shifts the meaning of the word 'scope' from the lexical (curly-bracket) scope used for variables to the non-lexical lifetime-style scope used for references. Without acknowledging the shift, beginners may conflate the two. Prepend one sentence to the existing paragraph to make the distinguishing factor explicit.
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Fixes #4706
Summary
Chapter 4-2 introduces a non-lexical-lifetime-style scope for
references but does not flag the shift away from the lexical scope
used for variables in earlier chapters. Beginners coming from
other languages may conflate the two meanings.
This commit prepends one sentence that makes the distinction
explicit, leaving the substantive explanation unchanged.
Test plan
AI assistance
Prepared with help from an AI coding assistant.