Don't warn about unused vars whose name starts with _

marijnh · marijnh · commit 2885c67d473b · 2011-08-18T10:02:02.000+02:00
Closes #832
diff --git a/src/comp/middle/tstate/ck.rs b/src/comp/middle/tstate/ck.rs
@@ -52,8 +52,9 @@ fn check_unused_vars(fcx: &fn_ctxt) {
     for c: norm_constraint in constraints(fcx) {
         alt c.c.node {
           ninit(id, v) {
-            if !vec_contains(fcx.enclosing.used_vars, id) {
-                fcx.ccx.tcx.sess.span_warn(c.c.span, "Unused variable " + v);
+            if !vec_contains(fcx.enclosing.used_vars, id) &&
+               v.(0) != ('_' as u8) {
+                fcx.ccx.tcx.sess.span_warn(c.c.span, "unused variable " + v);
             }
           }
           _ {/* ignore pred constraints */ }

Original file line number	Diff line number	Diff line change
`@@ -52,8 +52,9 @@ fn check_unused_vars(fcx: &fn_ctxt) {`
`52`	`52`	`for c: norm_constraint in constraints(fcx) {`
`53`	`53`	`alt c.c.node {`
`54`	`54`	`ninit(id, v) {`
`55`		`- if !vec_contains(fcx.enclosing.used_vars, id) {`
`56`		`- fcx.ccx.tcx.sess.span_warn(c.c.span, "Unused variable " + v);`
	`55`	`+ if !vec_contains(fcx.enclosing.used_vars, id) &&`
	`56`	`+ v.(0) != ('_' as u8) {`
	`57`	`+ fcx.ccx.tcx.sess.span_warn(c.c.span, "unused variable " + v);`
`57`	`58`	`}`
`58`	`59`	`}`
`59`	`60`	`_ {/* ignore pred constraints */ }`