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patch 8.2.1407: Vim9: type of list and dict only depends on first item

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Problem:    Vim9: type of list and dict only depends on first item.
Solution:   Use all items to decide about the type.
This commit is contained in:
Bram Moolenaar
2020-08-09 17:22:04 +02:00
parent a1b9b0cc01
commit 127542bceb
6 changed files with 91 additions and 17 deletions
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8
runtime/doc/vim9.txt
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@ -619,6 +619,8 @@ called in the same way the declaration is the same.
Custom types can be defined with `:type`: >
:type MyList list<string>
Custom types must start with a capital letter, to avoid name clashes with
builtin types added later, similarly to user functions.
{not implemented yet}
And classes and interfaces can be used as types: >
@ -645,6 +647,12 @@ declaring a variable and giving it a value: >
let var = 0 " infers number type
let var = 'hello' " infers string type
The type of a list and dictionary comes from the common type of the values.
If the values all have the same type, that type is used for the list or
dictionary. If there is a mix of types, the "any" type is used. >
[1, 2, 3] list<number>
['a', 'b', 'c'] list<string>
[1, 'x', 3] list<any>
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