Current HEAD of 776424a8f9158bfe9f53aa55f931af9f73437caf
("parser: Add dollar single quote"):
$ printf '%s\n' $'\123'
simply hangs.
strace shows
read(0, printf '%s\n' $'\123'
"printf '%s\\n' $'\\123'\n", 8192) = 22
read(0,
Bisecting this says that this is the first problematic commit.
Actually writing around five bytes makes it write the S\n and continue
(and interpret those five bytes as-if typed at the prompt).
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