checker: change non-const size of fixed array error message (#8850)

vlib/v/checker/checker.v

@@ -2993,8 +2993,7 @@ pub fn (mut c Checker) array_init(mut array_init ast.ArrayInit) table.Type {
 						fixed_size = cint
 					}
 				} else {
-					c.error('non existent integer const $init_expr.name while initializing the size of a static array',
-						array_init.pos)
+					c.error('non-constant array bound `$init_expr.name`', init_expr.pos)
 				}
 			}
 			else {

vlib/v/checker/tests/fixed_array_non_const_size_err.out

@@ -0,0 +1,7 @@
+vlib/v/checker/tests/fixed_array_non_const_size_err.vv:4:12: error: non-constant array bound `size`
+    2 |     size := 2
+    3 |
+    4 |     array := [size]int{}
+      |               ~~~~
+    5 |
+    6 |     println(array)

vlib/v/checker/tests/fixed_array_non_const_size_err.vv

@@ -0,0 +1,7 @@
+fn main() {
+	size := 2
+
+	array := [size]int{}
+
+	println(array)
+}

vlib/v/parser/parse_type.v

@@ -22,12 +22,11 @@ pub fn (mut p Parser) parse_array_type() table.Type {
 					if const_field.expr is ast.IntegerLiteral {
 						fixed_size = const_field.expr.val.int()
 					} else {
-						p.error_with_pos('non existent integer const $size_expr.name while initializing the size of a static array',
+						p.error_with_pos('non-constant array bound `$size_expr.name`',
 							size_expr.pos)
 					}
 				} else {
-					p.error_with_pos('non existent integer const $size_expr.name while initializing the size of a static array',
-						size_expr.pos)
+					p.error_with_pos('non-constant array bound `$size_expr.name`', size_expr.pos)
 				}
 			}
 			else {