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add runnableExamples for prepareStrMutation (#17227)

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* Update lib/system.nim

Co-authored-by: Timothee Cour <timothee.cour2@gmail.com>
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flywind 2021-03-02 19:52:07 +08:00 • committed by GitHub
commit dfa0a6b4a6
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2 changed files with 9 additions and 2 deletions
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lib/system/strs_v2.nim
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@ -171,7 +171,7 @@ proc nimPrepareStrMutationV2(s: var NimStringV2) {.compilerRtl, inline.} =
proc prepareStrMutation*(s: var string) {.inline.} =
# string literals are "copy on write", so you need to call
# `prepareStrMutation` before modifying the strings.
# `prepareStrMutation` before modifying the strings via `addr`.
{.cast(noSideEffect).}:
let s = unsafeAddr s
nimPrepareStrMutationV2(cast[ptr NimStringV2](s)[])