fix tests

Author: tdyas

src/rust/engine/options/src/args_tests.rs

@@ -95,7 +95,7 @@ fn test_float() {
 
     assert_eq!(
         "Problem parsing --bad float value:\n1:swallow\n  ^\n\
-        Expected \"+\", \"-\" or ['0' ..= '9'] at line 1 column 1"
+        Expected \"+\", \"-\" or ['0'..='9'] at line 1 column 1"
             .to_owned(),
         args.get_float(&option_id!("bad")).unwrap_err()
     );

src/rust/engine/options/src/env_tests.rs

@@ -138,7 +138,7 @@ fn test_float() {
 
     assert_eq!(
         "Problem parsing PANTS_BAD float value:\n1:swallow\n  ^\n\
-        Expected \"+\", \"-\" or ['0' ..= '9'] at line 1 column 1"
+        Expected \"+\", \"-\" or ['0'..='9'] at line 1 column 1"
             .to_owned(),
         env.get_float(&option_id!("pants", "bad")).unwrap_err()
     );

src/rust/engine/options/src/parse_tests.rs

@@ -89,13 +89,13 @@ fn test_parse_int() {
     check_int(9223372036854775807, "9223372036854775807");
     check_int(-9223372036854775808, "-9223372036854775808");
     assert_eq!(
-        "Problem parsing foo int value:\n1:badint\n  ^\nExpected \"+\", \"-\" or ['0' ..= '9'] \
+        "Problem parsing foo int value:\n1:badint\n  ^\nExpected \"+\", \"-\" or ['0'..='9'] \
                at line 1 column 1"
             .to_owned(),
         parse_int("badint").unwrap_err().render("foo")
     );
     assert_eq!(
-        "Problem parsing foo int value:\n1:12badint\n  --^\nExpected \"_\", EOF or ['0' ..= '9'] \
+        "Problem parsing foo int value:\n1:12badint\n  --^\nExpected \"_\", EOF or ['0'..='9'] \
                at line 1 column 3"
             .to_owned(),
         parse_int("12badint").unwrap_err().render("foo")