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Fix fetching arguments on the wasm32-wasi target

Fixes an error introduced in #66750 where wasi executables always think
they have zero arguments because one of the vectors returned here
accidentally thought it was length 0.
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alexcrichton committed Dec 5, 2019
1 parent a0312c1 commit f7789ad5b23f0bb526f0cebdfc606374882d6feb
Showing with 1 addition and 0 deletions.
  1. +1 −0 src/libstd/sys/wasi/args.rs
@@ -26,6 +26,7 @@ fn maybe_args() -> Option<Vec<OsString>> {
let mut argv = Vec::with_capacity(argc);
let mut buf = Vec::with_capacity(buf_size);
wasi::args_get(argv.as_mut_ptr(), buf.as_mut_ptr()).ok()?;
argv.set_len(argc);
let mut ret = Vec::with_capacity(argc);
for ptr in argv {
let s = CStr::from_ptr(ptr.cast());

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