From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eli Zaretskii <eliz@gnu.org>
Subject: Re: keybindings again...
Date: Fri, 30 Jun 2017 09:17:05 +0300
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	Jean-Christophe Helary on Fri, 30 Jun 2017 14:10:50 +0900)
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> From: Jean-Christophe Helary <jean.christophe.helary@gmail.com>
> Date: Fri, 30 Jun 2017 14:10:50 +0900
> 
> Do you mean that Shift is not recognized as a modified key by the terminal ?

No, that's not it.  The problem is that on a TTY, the way Emacs reads
keyboard input returns only characters, it doesn't return function
keys.  So Shift-a returns 'A', because the keyboard driver generates
an upper-case A when you type that.  But there's no up-cased RET
character, so you get just RET.

Keys like F1 work on a TTY by emitting a sequence of characters,
usually starting with ESC, and Emacs binds that sequence in special
keymaps in a way that produces the symbol F1.  But Shift-RET doesn't
produce any such sequence, so there's nothing Emacs can do in that
case.