From d64a4b57aef5e1f0a51bbae24b73e5a7acd20aef Mon Sep 17 00:00:00 2001
From: Guillaume Gomez <guillaume1.gomez@gmail.com>
Date: Sat, 4 Jul 2020 00:12:16 +0200
Subject: [PATCH] Create new E0768 error code for "no valid digits found for
 number" error

---
 src/librustc_error_codes/error_codes.rs       |  1 +
 src/librustc_error_codes/error_codes/E0768.md | 13 +++++++++++++
 src/librustc_parse/lexer/mod.rs               |  9 ++++++++-
 3 files changed, 22 insertions(+), 1 deletion(-)
 create mode 100644 src/librustc_error_codes/error_codes/E0768.md

diff --git a/src/librustc_error_codes/error_codes.rs b/src/librustc_error_codes/error_codes.rs
index 00c072e1b04a..f687221d78e0 100644
--- a/src/librustc_error_codes/error_codes.rs
+++ b/src/librustc_error_codes/error_codes.rs
@@ -449,6 +449,7 @@ E0764: include_str!("./error_codes/E0764.md"),
 E0765: include_str!("./error_codes/E0765.md"),
 E0766: include_str!("./error_codes/E0766.md"),
 E0767: include_str!("./error_codes/E0767.md"),
+E0768: include_str!("./error_codes/E0768.md"),
 ;
 //  E0006, // merged with E0005
 //  E0008, // cannot bind by-move into a pattern guard
diff --git a/src/librustc_error_codes/error_codes/E0768.md b/src/librustc_error_codes/error_codes/E0768.md
new file mode 100644
index 000000000000..24169ef512ef
--- /dev/null
+++ b/src/librustc_error_codes/error_codes/E0768.md
@@ -0,0 +1,13 @@
+A number in a non-decimal base has no digits.
+
+Erroneous code example:
+
+```compile_fail,E0768
+let s: i32 = 0b; // error!
+```
+
+To fix this error, add the missing digits:
+
+```
+let s: i32 = 0b1; // ok!
+```
diff --git a/src/librustc_parse/lexer/mod.rs b/src/librustc_parse/lexer/mod.rs
index 5050f03bea9b..2b0e637c74e5 100644
--- a/src/librustc_parse/lexer/mod.rs
+++ b/src/librustc_parse/lexer/mod.rs
@@ -391,7 +391,14 @@ impl<'a> StringReader<'a> {
             }
             rustc_lexer::LiteralKind::Int { base, empty_int } => {
                 return if empty_int {
-                    self.err_span_(start, suffix_start, "no valid digits found for number");
+                    self.sess
+                        .span_diagnostic
+                        .struct_span_err_with_code(
+                            self.mk_sp(start, suffix_start),
+                            "no valid digits found for number",
+                            error_code!(E0768),
+                        )
+                        .emit();
                     (token::Integer, sym::integer(0))
                 } else {
                     self.validate_int_literal(base, start, suffix_start);