- @if now does implicit conversion to bool like $if. #2086

releasenotes.md

@@ -22,6 +22,7 @@
 - Correctly detect multiple overloads of the same type.
 - ABI bug on x64 Linux / MacOS when passing a union containing a struct of 3 floats. #2087 
 - Bug with slice acces as inline struct member #2088.
+- `@if` now does implicit conversion to bool like `$if`. #2086
 
 ### Stdlib changes
 - Hash functions for integer vectors and arrays.

src/compiler/sema_decls.c

@@ -3126,7 +3126,7 @@ static bool sema_analyse_attribute(SemaContext *context, ResolvedAttrData *attr_
 		case ATTRIBUTE_IF:
 			if (!expr) RETURN_SEMA_ERROR(attr, "'@if' requires a boolean argument.");
 			if (!sema_analyse_expr(context, expr)) return false;
-			if (expr->type->canonical != type_bool || !sema_cast_const(expr))
+			if (!cast_explicit_silent(context, expr, type_bool) || !sema_cast_const(expr))
 			{
 				RETURN_SEMA_ERROR(expr, "Expected a boolean compile time constant value.");
 			}

test/test_suite/compile_time/ct_if_bool_conversion_2086.c3

@@ -0,0 +1,11 @@
+module test;
+
+fn void main()
+{
+    int $a = 0;
+    $if $a:
+    $endif;
+    int a @if(!$a);
+    int a @if($a);
+    int a @if((bool)$a);
+}