[vim/vim] vim9 script and legacy does not handle expression mappings (Issue #20176)

[Christian Brabandt]

chrisbra created an issue (vim/vim#20176)

Steps to reproduce

I noticed this while reviewing #20152

Source this script:

vim9script

:legacy inoremap <expr> <F2> "hello " . "world"

Go to insert mode and press <f2>.
It errors out with:

E488: Trailing characters: . "world"

Expected behaviour

should input "hello world". It works when using .. for the concatenation.

Version of Vim

9.2.0461

Environment

linux, putty, xterm-256color, zsh

Logs and stack traces

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[Christian Brabandt]

chrisbra left a comment (vim/vim#20176)

fixed by #20177

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[Christian Brabandt]

Closed #20176 as completed.

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