digitalmars.D.bugs - [Issue 19969] New: Unhelpful error when attempting (incorrectly) to
- d-bugmail puremagic.com (31/31) Jun 15 2019 https://issues.dlang.org/show_bug.cgi?id=19969
https://issues.dlang.org/show_bug.cgi?id=19969 Issue ID: 19969 Summary: Unhelpful error when attempting (incorrectly) to append to a string Product: D Version: D2 Hardware: All OS: All Status: NEW Severity: enhancement Priority: P1 Component: dmd Assignee: nobody puremagic.com Reporter: peter.alexander.au gmail.com void main() { string s; s += "foo"; // Error: slice s is not mutable } Of course, the user meant to use ~=, but many other languages use += so this will be a common occurrence. An error is expected here, but erroring on mutability is unhelpful. It's also incorrect since the slice *is* mutable (even though the elements are not). Note, with a mutable string, you get a more helpful error: void main() { char[] s; s += "foo"; // Error: invalid array operation s += "foo" (possible missing []) } The enhancement request here is for a better error. Preferably something mentioning that the operation is invalid. --
Jun 15 2019