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-rw-r--r--libbuild2/parser.cxx23
1 files changed, 21 insertions, 2 deletions
diff --git a/libbuild2/parser.cxx b/libbuild2/parser.cxx
index c8f66de..b4df45b 100644
--- a/libbuild2/parser.cxx
+++ b/libbuild2/parser.cxx
@@ -7759,8 +7759,27 @@ namespace build2
// This should be a simple value or a simple directory.
//
if (lv.size () > 1)
- fail (loc) << "concatenating " << what << " contains multiple "
- << "values";
+ {
+ diag_record dr (fail (loc));
+
+ dr << "concatenating " << what << " contains multiple values";
+
+ // See if this looks like a subscript without an evaluation
+ // context and help the user out.
+ //
+ if (mode () != lexer_mode::eval)
+ {
+ const token& t (peeked ()); // Should be peeked at.
+
+ if (t.type == type::word &&
+ t.qtype == quote_type::unquoted &&
+ t.value[0] == '[')
+ {
+ dr << info << "wrap it in (...) evaluation context if this "
+ << "is value subscript";
+ }
+ }
+ }
const name& n (lv[0]);