compiler: better error for unexpected digit

A digit character is not invalid in general, but it's not permitted
at the start of an identifier.  Report a better error message.
The test case is issue11359.go in the source repo.

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/278174

diff --git a/gcc/go/gofrontend/MERGE b/gcc/go/gofrontend/MERGE
index 681debb0392d76883746b0636a5c794c0ab9d757..1bada25300dbf486250ac2923f8c2b483bdc1241 100644 (file)
--- a/gcc/go/gofrontend/MERGE
+++ b/gcc/go/gofrontend/MERGE
@@ -1,4 +1,4 @@
-3e8f49a2137a87fdaba51c3002ddbe41ab18ed46
+8b913a1865e36d4bd105f29aa0b12264a4e03515
 
 The first line of this file holds the git revision number of the last
 merge done from the gofrontend repository.

diff --git a/gcc/go/gofrontend/lex.cc b/gcc/go/gofrontend/lex.cc
index 156a90c7baf26d5042b902bca94bf95c7c152324..e71b8cddf652c85686dcc0cfca1acc7c926f0a80 100644 (file)
--- a/gcc/go/gofrontend/lex.cc
+++ b/gcc/go/gofrontend/lex.cc
@@ -743,6 +743,13 @@ Lex::next_token()
                if (Lex::is_unicode_letter(ci))
                  return this->gather_identifier();
 
+               if (!issued_error && Lex::is_unicode_digit(ci))
+                 {
+                   go_error_at(this->location(),
+                               "identifier cannot begin with digit");
+                   issued_error = true;
+                 }
+
                if (!issued_error)
                  go_error_at(this->location(),
                              "invalid character 0x%x in input file",