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-rw-r--r--src/nvim/viml/parser/expressions.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/src/nvim/viml/parser/expressions.c b/src/nvim/viml/parser/expressions.c
index 13f7131744..07bac89997 100644
--- a/src/nvim/viml/parser/expressions.c
+++ b/src/nvim/viml/parser/expressions.c
@@ -40,6 +40,13 @@
// E15: Invalid expression: [1,
//
// < , just exactly one E697 message.
+// 6. Some expressions involving calling parenthesis which are treated
+// separately by Vim even when not separated by spaces are treated as one
+// expression by Neovim: e.g. ":echo (1)(1)" will yield runtime error after
+// failing to call "1", while Vim will echo "1 1". Reasoning is the same:
+// type of what is in the first expression is generally not known when
+// parsing, so to have separate expressions like this separate them with
+// spaces.
#include <stdbool.h>
#include <stddef.h>