ghc -e sometimes spills control characters into its output
The behaviour depends on the TERM variable. For example,
# TERM=xterm ghc -e 'return ()' | od -a
0000000 esc [ ? 1 0 3 4 h
0000010Workaround: unset the TERM variable.
Analysis: Those control characters are emitted by libreadline on initialisation. They enable the terminal's meta mode.
Trac metadata
| Trac field | Value |
|---|---|
| Version | 6.8.2 |
| Type | Bug |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | GHCi |
| Test case | |
| Differential revisions | |
| BlockedBy | |
| Related | |
| Blocking | |
| CC | |
| Operating system | |
| Architecture | Unknown |