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-rw-r--r--src/libexpr/lexer.l1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libexpr/lexer.l b/src/libexpr/lexer.l
index 38d403c9fade..d5a14f517acc 100644
--- a/src/libexpr/lexer.l
+++ b/src/libexpr/lexer.l
@@ -59,6 +59,7 @@ inherit     { return INHERIT; }
 \|\|        { return OR; }
 \-\>        { return IMPL; }
 \/\/        { return UPDATE; }
+\+\+        { return CONCAT; }
 
 {ID}        { yylval->t = ATmake("<str>", yytext); return ID; /* !!! alloc */ }
 {INT}       { int n = atoi(yytext); /* !!! overflow */