vala: Reject unary operations on nullable integer/floating and boolean type

Prefer to report a semantic error rather than creating invalid c-code.

Fixes https://gitlab.gnome.org/GNOME/vala/issues/772

1 files changed, 3 insertions, 3 deletions

diff --git a/vala/valaunaryexpression.vala b/vala/valaunaryexpression.vala
index d371d39d9..c2ef3ab08 100644
--- a/vala/valaunaryexpression.vala
+++ b/vala/valaunaryexpression.vala
@@ -111,7 +111,7 @@ public class Vala.UnaryExpression : Expression {
 	}
 
 	bool is_numeric_type (DataType type) {
-		if (!(type.data_type is Struct)) {
+		if (type.nullable || !(type.data_type is Struct)) {
 			return false;
 		}
 
@@ -120,7 +120,7 @@ public class Vala.UnaryExpression : Expression {
 	}
 
 	bool is_integer_type (DataType type) {
-		if (!(type.data_type is Struct)) {
+		if (type.nullable || !(type.data_type is Struct)) {
 			return false;
 		}
 
@@ -177,7 +177,7 @@ public class Vala.UnaryExpression : Expression {
 			value_type = inner.value_type;
 		} else if (operator == UnaryOperator.LOGICAL_NEGATION) {
 			// boolean type
-			if (!inner.value_type.compatible (context.analyzer.bool_type)) {
+			if (inner.value_type.nullable || !inner.value_type.compatible (context.analyzer.bool_type)) {
 				error = true;
 				Report.error (source_reference, "Operator not supported for `%s'".printf (inner.value_type.to_string ()));
 				return false;