parser: don't print expected if there aren't any

1 files changed, 12 insertions, 4 deletions

diff --git a/modelica-parser-lalrpop/src/lib.rs b/modelica-parser-lalrpop/src/lib.rs
index f6f1e8b..a109607 100644
--- a/modelica-parser-lalrpop/src/lib.rs
+++ b/modelica-parser-lalrpop/src/lib.rs
@@ -45,15 +45,23 @@ pub fn pp_parseerror(raw: &str, pe: ParseError<usize, (usize, &str), ()>) -> Str
                 "parse error:".red().bold(),
                 pp_segment(raw, location, location+1)) },
         ParseError::UnrecognizedToken{token: Some((start, (_, tok), end)), expected} => {
-            format!("{} unrecognized token '{}' (expected one of {:?}):\n{}",
+            format!("{} unrecognized token '{}'{}:\n{}",
                 "parse error:".red().bold(),
                 tok,
-                expected,
+                if expected.len() > 0 {
+                    format!(" (expected one of {:?})", expected)
+                } else {
+                    format!("")
+                },
                 pp_segment(raw, start, end)) },
         ParseError::UnrecognizedToken{token: None, expected} => {
-            format!("{} premature end-of-file (expected one of {:?})",
+            format!("{} premature end-of-file{}",
                 "parse error:".red().bold(),
-                expected) },
+                if expected.len() > 0 {
+                    format!(" (expected one of {:?})", expected)
+                } else {
+                    format!("")
+                }) },
         ParseError::ExtraToken{token: (start, (_, tok), end)} => {
             format!("{} unexpected extra token '{}':\n{}",
                 "parse error:".red().bold(),