code review 5323070: gc: fix spelling of "GOEXPERIMENT" in a comment.

src/cmd/gc/lex.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.
 
 #include        <u.h>
 #include        <libc.h>
 #include        "go.h"
 #include        "y.tab.h"
 #include        <ar.h>
 
@@ skipping 13 matching lines @@
 static void     yytinit(void);
 static int      getc(void);
 static void     ungetc(int);
 static int32    getr(void);
 static int      escchar(int, int*, vlong*);
 static void     addidir(char*);
 static int      getlinepragma(void);
 static char *goos, *goarch, *goroot;
 
 // Compiler experiments.
-// These are controlled by the GCEXPERIMENT environment
+// These are controlled by the GOEXPERIMENT environment
 // variable recorded when the compiler is built.
 static struct {
         char *name;
         int *val;
 } exper[] = {
         {"rune32", &rune32},
 };
 
 static void
 addexp(char *s)
@@ skipping 2051 matching lines @@
                         p = infile;
                 else
                         p = p+1;
                 snprint(namebuf, sizeof(namebuf), "%s", p);
                 p = strrchr(namebuf, '.');
                 if(p != nil)
                         *p = 0;
                 outfile = smprint("%s.%c", namebuf, thechar);
         }
 }