builtin: define C.abs()

Author: medvednikov

vlib/builtin/cfns.c.v

@@ -53,6 +53,7 @@ fn C.chmod(&char, u32) int
 fn C.printf(&char, ...voidptr) int
 
 fn C.puts(&char) int
+fn C.abs(f64) f64
 
 fn C.fputs(str &char, stream &C.FILE) int
 

vlib/v/parser/containers.v

@@ -69,7 +69,7 @@ fn (mut p Parser) array_init() ast.ArrayInit {
 			// [100]u8
 			elem_type = p.parse_type()
 			if p.table.sym(elem_type).name == 'byte' {
-				p.error('`byte` has been deprecated in favor of `u8`: use `[10]u8` instead of `[10]byte`')
+				p.error('`byte` has been deprecated in favor of `u8`: use `[10]u8{}` instead of `[10]byte{}`')
 			}
 			last_pos = p.tok.pos()
 			is_fixed = true