I accidentally typed an extra asterisk in the format specifier. I know that it is wrong but the error isn't clear about what and where the error is.
import std.stdio; void main() { writef("%*10s", 100); } and I got the following error message(s): $ dmd -run writef.d std.format.FormatException@std/format.d(978): $ expected ---------------- ??:? pure @safe bool std.exception.enforceEx!(std.format.FormatException).enforceEx!(bool).enforceEx(bool, lazy immutable(char)[], immutable(char)[], ulong) [0x437786] ??:? pure @safe void std.format.FormatSpec!(char).FormatSpec.fillUp() [0x44754b] ??:? @safe bool std.format.FormatSpec!(char).FormatSpec.writeUpToNextSpec!(std.stdio.File.LockingTextWriter).writeUpToNextSpec(std.stdio.File.LockingTextWriter) [0x438173] ??:? @safe uint std.format.formattedWrite!(std.stdio.File.LockingTextWriter, char, int).formattedWrite(std.stdio.File.LockingTextWriter, const(char[]), int) [0x436f99] ??:? @safe void std.stdio.File.writefln!(char, int).writefln(const(char[]), int) [0x436e9c] ??:? @safe void std.stdio.writefln!(immutable(char)[], int).writefln(immutable(char)[], int) [0x436deb] ??:? _Dmain [0x436d9f] ??:? _D2rt6dmain211_d_run_mainUiPPaPUAAaZiZ6runAllMFZ9__lambda1MFZv [0x443cc2] ??:? void rt.dmain2._d_run_main(int, char**, extern (C) int function(char[][])*).tryExec(scope void delegate()) [0x443c18] ??:? void rt.dmain2._d_run_main(int, char**, extern (C) int function(char[][])*).runAll() [0x443c7e] ??:? void rt.dmain2._d_run_main(int, char**, extern (C) int function(char[][])*).tryExec(scope void delegate()) [0x443c18] ??:? _d_run_main [0x443b75] ??:? main [0x43f8d5] ??:? __libc_start_main [0xba3cc60f]