Bug 10449 – Better error message when concatenating string

void main () { auto x = "str1" ~ ~ "str2"; // Error: '"str2"' is not of integral type, it is a string } Next time I will know, but it is quite confusing, it should say. "prefix operator '~' can be applied only to integral type, not to a string. If you are trying to concatenate string then check for redundant '~'."

From 2.065, the message is changed. With git-head (2.068a), it prints: test.d(4): Error: invalid array operation ~"str2" (possible missing []) It shows the applied prefix operator `~` in message, so I think it's improved.