code review 4634073: gc: Escape analysis.

src/cmd/gc/select.c

 // Copyright 2009 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
 /*
  * select
  */
 
 #include "go.h"
 
@@ skipping 41 matching lines @@
                                         n->right = n->right->left;
 
                                 if(n->right->op != ORECV) {
                                         yyerror("select assignment must have receive on right hand side");
                                         break;
                                 }
                                 n->op = OSELRECV;
                                 break;
 
                         case OAS2RECV:
-                                // convert x, ok = <-c into OSELRECV(x, <-c) with ntest=ok
+                                // convert x, ok = <-c into OSELRECV2(x, <-c) with ntest=ok
                                 if(n->right->op != ORECV) {
                                         yyerror("select assignment must have receive on right hand side");
                                         break;
                                 }
                                 n->op = OSELRECV2;
                                 n->left = n->list->n;
                                 n->ntest = n->list->next->n;
                                 n->right = n->rlist->n;
                                 break;
 
                         case ORECV:
                                 // convert <-c into OSELRECV(N, <-c)
                                 n = nod(OSELRECV, N, n);
+                                n->typecheck = 1;
                                 ncase->left = n;
                                 break;
 
                         case OSEND:
                                 break;
                         }
                 }
                 typechecklist(ncase->nbody, Etop);
         }
         sel->xoffset = count;
@@ skipping 256 matching lines @@
         // run the select
         setlineno(sel);
         init = list(init, mkcall("selectgo", T, nil, var));
         sel->nbody = init;
 
 out:
         sel->list = nil;
         walkstmtlist(sel->nbody);
         lineno = lno;
 }