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eval: add v:_null_string

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Replacement for Vim's test_null_string().
Vim uses it to verify that its codebase handles null strings.
Preparation for the Test_null_list() in patch v8.2.1822.

Use v:_null_string, not non-existent env var, for null string tests.

Mention v:_null_string in id() because id(v:_null_string) returns (nil).
This commit is contained in:
Jan Edmund Lazo
2021-04-08 22:33:21 -04:00
parent ec273a2c6b
commit 0d0eeff8a3
5 changed files with 45 additions and 8 deletions
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15
runtime/doc/eval.txt
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@@ -5563,13 +5563,14 @@ id({expr}) *id()*
Returns a |String| which is a unique identifier of the
container type (|List|, |Dict| and |Partial|). It is
guaranteed that for the mentioned types `id(v1) ==# id(v2)`
returns true iff `type(v1) == type(v2) && v1 is v2` (note:
|v:_null_list| and |v:_null_dict| have the same `id()` with
different types because they are internally represented as
a NULL pointers). Currently `id()` returns a hexadecimal
representanion of the pointers to the containers (i.e. like
`0x994a40`), same as `printf("%p", {expr})`, but it is advised
against counting on exact format of return value.
returns true iff `type(v1) == type(v2) && v1 is v2`.
Note that |v:_null_string|, |v:_null_list|, and |v:_null_dict|
have the same `id()` with different types because they are
internally represented as a NULL pointers. `id()` returns a
hexadecimal representanion of the pointers to the containers
(i.e. like `0x994a40`), same as `printf("%p", {expr})`,
but it is advised against counting on the exact format of
return value.
It is not guaranteed that `id(no_longer_existing_container)`
will not be equal to some other `id()`: new containers may