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patch 8.2.2753: Vim9: cannot ignore an item in assignment unpack

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Problem:    Vim9: cannot ignore an item in assignment unpack.
Solution:   Allow using an underscore.
This commit is contained in:
Bram Moolenaar
2021-04-10 22:35:43 +02:00
parent e8e3078184
commit f93bbd0262
7 changed files with 46 additions and 22 deletions
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19
runtime/doc/vim9.txt
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@@ -335,6 +335,18 @@ The "g:" prefix is not needed for auto-load functions.
Since `&opt = value` is now assigning a value to option "opt", ":&" cannot be
used to repeat a `:substitute` command.
For an unpack assignment the underscore can be used to ignore a list item,
similar to how a function argument can be ignored: >
[a, _, c] = theList
[a, b; _] = longList
< *E1092*
Declaring more than one variable at a time, using the unpack notation, is
currently not supported: >
var [v1, v2] = GetValues() # Error!
That is because the type needs to be inferred from the list item type, which
isn't that easy.
Constants ~
*vim9-const* *vim9-final*
@@ -368,13 +380,6 @@ The constant only applies to the value itself, not what it refers to. >
NAMES[1] = ["Emma"] # Error!
NAMES[1][0] = "Emma" # OK, now females[0] == "Emma"
< *E1092*
Declaring more than one variable at a time, using the unpack notation, is
currently not supported: >
var [v1, v2] = GetValues() # Error!
That is because the type needs to be inferred from the list item type, which
isn't that easy.
Omitting :call and :eval ~