994137dcf7
Reading from a pty master returns `EIO` once the slave side closes, however, `readLine` lets it propagate as an uncaught `SysError`, which causes spurious build failures in gvisor and similar sandboxed environments where pty teardown races differently. This commit catches `EIO` inside the read lambda and maps it to a zero-length read, reusing the existing EOF path.
Nix
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