From dac2c1d90de23ca6cb3db88992885b116199a848 Mon Sep 17 00:00:00 2001
From: Adrian Thurston <thurston@colm.net>
Date: Sat, 30 Nov 2019 09:01:25 -0800
Subject: rust grammar: handle floats specified with just a trailing dot

let a = 0. + 1.- 2.3;
---
 grammar/rust.lm | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

(limited to 'grammar')

diff --git a/grammar/rust.lm b/grammar/rust.lm
index ad6d25d8..b5cc7bb6 100644
--- a/grammar/rust.lm
+++ b/grammar/rust.lm
@@ -37,7 +37,14 @@ lex
 	rl float_suffix
 		/ ( 'f32' | 'f64' )? /
 
-	# Not implemented: DEC_LITERAL . (not immediately followed by ., _ or an identifier)
+	# Handles: DEC_LITERAL . (not immediately followed by ., _ or an identifier)
+	token hanging_float
+		/ [0-9]+ '.' [^0-9._a-zA-Z] /
+		{
+			Float: str = input->pull( match_length - 1 )
+			input->push( make_token( typeid<float>, Float )  )
+		}
+
 	token float/
 		[0-9]+ float_exponent |
 		[0-9]+ '.' [0-9]+ float_exponent? |
-- 
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