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| -rw-r--r-- | src/doc/book/patterns.md | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/src/doc/book/patterns.md b/src/doc/book/patterns.md index 8f4a7a43955..43f1bd2529f 100644 --- a/src/doc/book/patterns.md +++ b/src/doc/book/patterns.md @@ -27,7 +27,7 @@ There’s one pitfall with patterns: like anything that introduces a new binding they introduce shadowing. For example: ```rust -let x = 'x'; +let x = 1; let c = 'c'; match c { @@ -41,12 +41,14 @@ This prints: ```text x: c c: c -x: x +x: 1 ``` In other words, `x =>` matches the pattern and introduces a new binding named -`x` that’s in scope for the match arm. Because we already have a binding named -`x`, this new `x` shadows it. +`x`. This new binding is in scope for the match arm and takes on the value of +`c`. Notice that the value of `x` outside the scope of the match has no bearing +on the value of `x` within it. Because we already have a binding named `x`, this +new `x` shadows it. # Multiple patterns |