bug#31765: 26.1; Can't define alias for git in eshell

[Carlos Pita]

Try

    alias g git

then

    g log

or whatever inside a git repo. It always show the git help page, as in a
faulty git invocation.

---

In GNU Emacs 26.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.22.30)
 of 2018-05-29 built on juergen
Windowing system distributor 'The X.Org Foundation', version 11.0.11906000
System Description:     Manjaro Linux

Recent messages:
History item: 1
Completion function pcomplete-completions-at-point uses a deprecated calling 
convention
Saving file /home/carlos/.emacs.d/eshell/alias...
Wrote /home/carlos/.emacs.d/eshell/alias
History item: 128
History item: 127
History item: 126
No completions of /u
Saving file /home/carlos/.emacs.d/eshell/alias...
Wrote /home/carlos/.emacs.d/eshell/alias

Configured using:
 'configure --prefix=/usr --sysconfdir=/etc --libexecdir=/usr/lib
 --localstatedir=/var --with-x-toolkit=gtk3 --with-xft --with-modules
 'CFLAGS=-march=x86-64 -mtune=generic -O2 -pipe -fstack-protector-strong
 -fno-plt' CPPFLAGS=-D_FORTIFY_SOURCE=2
 LDFLAGS=-Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now'

Configured features:
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ACL GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB TOOLKIT_SCROLL_BARS
GTK3 X11 MODULES THREADS LIBSYSTEMD LCMS2

Important settings:
  value of $LC_MONETARY: en_US.UTF-8
  value of $LC_NUMERIC: en_US.UTF-8
  value of $LC_TIME: en_US.UTF-8
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Eshell

Minor modes in effect:
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  pyvenv-mode: t
  shell-dirtrack-mode: t
  winner-mode: t
  show-paren-mode: t
  ido-ubiquitous-mode: t
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  global-eldoc-mode: t
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  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
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Load-path shadows:
None found.

Features:
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Memory information:
((conses 16 476026 39124)
 (symbols 48 35670 2)
 (miscs 40 110 213)
 (strings 32 89797 2087)
 (string-bytes 1 2456578)
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