libsyntax: fail lexing with an error message on an int literal larger than 2^64.

Stops an ICE.

Closes #5544.

1 files changed, 9 insertions, 2 deletions

diff --git a/src/libsyntax/parse/lexer.rs b/src/libsyntax/parse/lexer.rs
index 5e06ecf6090..b6ec15d8641 100644
--- a/src/libsyntax/parse/lexer.rs
+++ b/src/libsyntax/parse/lexer.rs
@@ -442,7 +442,11 @@ fn scan_number(c: char, rdr: @mut StringReader) -> token::Token {
         if str::len(num_str) == 0u {
             rdr.fatal(~"no valid digits found for number");
         }
-        let parsed = u64::from_str_radix(num_str, base as uint).get();
+        let parsed = match u64::from_str_radix(num_str, base as uint) {
+            Some(p) => p,
+            None => rdr.fatal(~"int literal is too large")
+        };
+
         match tp {
           either::Left(t) => return token::LIT_INT(parsed as i64, t),
           either::Right(t) => return token::LIT_UINT(parsed, t)
@@ -503,7 +507,10 @@ fn scan_number(c: char, rdr: @mut StringReader) -> token::Token {
         if str::len(num_str) == 0u {
             rdr.fatal(~"no valid digits found for number");
         }
-        let parsed = u64::from_str_radix(num_str, base as uint).get();
+        let parsed = match u64::from_str_radix(num_str, base as uint) {
+            Some(p) => p,
+            None => rdr.fatal(~"int literal is too large")
+        };
 
         debug!("lexing %s as an unsuffixed integer literal",
                num_str);