cmd/compile: reject identifiers beginning with non-ASCII digit

Fixes #11359.

Change-Id: I0fdfa410939f7e42020cbb19d74a67e1cc3cd610
Reviewed-on: https://go-review.googlesource.com/16919
Reviewed-by: Ian Lance Taylor <iant@golang.org>

diff --git a/src/cmd/compile/internal/gc/lex.go b/src/cmd/compile/internal/gc/lex.go
index 7fd6a62dbad979a00e820cbcf4c833ef28bca93c..1f468c1dea931f1a27b5a5458276e3afd040405f 100644 (file)
--- a/src/cmd/compile/internal/gc/lex.go
+++ b/src/cmd/compile/internal/gc/lex.go
@@ -1469,6 +1469,9 @@ talph:
                        if !unicode.IsLetter(r) && !unicode.IsDigit(r) && (importpkg == nil || r != 0xb7) {
                                Yyerror("invalid identifier character U+%04x", r)
                        }
+                       if cp.Len() == 0 && unicode.IsDigit(r) {
+                               Yyerror("identifier cannot begin with digit U+%04x", r)
+                       }
                        cp.WriteRune(r)
                } else if !isAlnum(c) && c != '_' {
                        break

diff --git a/test/fixedbugs/issue11359.go b/test/fixedbugs/issue11359.go
new file mode 100644 (file)
index 0000000..6ffffed
--- /dev/null
+++ b/test/fixedbugs/issue11359.go
@@ -0,0 +1,11 @@
+// errorcheck
+
+// Copyright 2015 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.
+
+// identifiers beginning with non-ASCII digits were incorrectly accepted.
+// issue 11359.
+
+package p
+var ۶ = 0 // ERROR "identifier cannot begin with digit"