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patch 9.0.1796: Vim9 problems with null_objects

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Problem:  Vim9 problems with null_objects
Solution: Vim9 improve null_object usage

Fix "xvar == null", where xvar might have been assigned null_object.

Fix compilation failure: "var o2: C = null_object".

closes: #12890

Signed-off-by: Christian Brabandt <cb@256bit.org>
Co-authored-by: Ernie Rael <errael@raelity.com>
This commit is contained in:
Ernie Rael
2023-08-27 18:40:26 +02:00
committed by Christian Brabandt
parent d4e4ecbb37
commit 5c018bee0e
7 changed files with 54 additions and 4 deletions
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2
src/vim9type.c
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@@ -907,6 +907,8 @@ check_type_maybe(
return MAYBE; // use runtime type check
if (actual->tt_type != VAR_OBJECT)
return FAIL; // don't use tt_class
if (actual->tt_class == NULL)
return OK; // A null object matches
if (class_instance_of(actual->tt_class, expected->tt_class) == FALSE)
ret = FAIL;