non_bool_negation_expression
A negation operand must have a static type of 'bool'.
Description
#The analyzer produces this diagnostic when the operand of the unary
negation operator (!
) doesn't have the type bool
.
Example
#The following code produces this diagnostic because x
is an int
when it
must be a bool
:
dart
int x = 0;
bool y = !x;
Common fixes
#Replace the operand with an expression that has the type bool
:
dart
int x = 0;
bool y = !(x > 0);