On Sunday, 15 March 2020 at 00:04:09 UTC, Adnan wrote:
On Saturday, 14 March 2020 at 23:54:44 UTC, Adam D. Ruppe wrote:
On Saturday, 14 March 2020 at 23:39:11 UTC, Adnan wrote:
Full code

this worked for me when i copy/pasted it... are you sure that has the error? if so what compiler version you on?

This is indeed very strange, godbolt says it's alright: https://d.godbolt.org/z/DaaPxX

Now my compiler version:
$ dmd --version && ldc2 --version
DMD64 D Compiler v2.090.0
Copyright (C) 1999-2019 by The D Language Foundation, All Rights Reserved written by Walter Bright
LDC - the LLVM D compiler (1.18.0):
  based on DMD v2.088.1 and LLVM 9.0.0
  built with LDC - the LLVM D compiler (1.18.0)
  Default target: x86_64-unknown-linux-gnu
  Host CPU: znver1
  http://dlang.org - http://wiki.dlang.org/LDC

  Registered Targets:
    aarch64    - AArch64 (little endian)
    aarch64_32 - AArch64 (little endian ILP32)
    aarch64_be - AArch64 (big endian)
    arm        - ARM
    arm64      - ARM64 (little endian)
    arm64_32   - ARM64 (little endian ILP32)
    armeb      - ARM (big endian)
    mips       - MIPS (32-bit big endian)
    mips64     - MIPS (64-bit big endian)
    mips64el   - MIPS (64-bit little endian)
    mipsel     - MIPS (32-bit little endian)
    msp430     - MSP430 [experimental]
    nvptx      - NVIDIA PTX 32-bit
    nvptx64    - NVIDIA PTX 64-bit
    ppc32      - PowerPC 32
    ppc64      - PowerPC 64
    ppc64le    - PowerPC 64 LE
    riscv32    - 32-bit RISC-V
    riscv64    - 64-bit RISC-V
    thumb      - Thumb
    thumbeb    - Thumb (big endian)
    wasm32     - WebAssembly 32-bit
    wasm64     - WebAssembly 64-bit
    x86        - 32-bit X86: Pentium-Pro and above
    x86-64     - 64-bit X86: EM64T and AMD64


Note that both ldc2 and dmd has the same complain

d$ dmd --version && cat source/app.d && dub build
DMD64 D Compiler v2.090.0
Copyright (C) 1999-2019 by The D Language Foundation, All Rights Reserved written by Walter Bright
string smallestRepr(const string arg) {
        auto repeated = arg ~ arg;
        string result = arg;
        foreach (i; 1 .. arg.length) {
                const slice = repeated[i .. i + arg.length];
                if (slice < result)
                        result = slice;
        }
        return result;
}

unittest {
        assert("cba".smallestRepr() == "acb");
}

void main(const string[] args) {
        import std.stdio : write, File;
        import std.container : Array;

        Array!string[string] wordTable;

        foreach (string word; File(args[1]).byLineCopy()) {
                word = word[0 .. $ - 1]; // strip the newline character
                const string key = word.smallestRepr();
                debug {
                        if (key in wordTable)
                                wordTable[key] ~= word;
                        else
                                wordTable[key] = Array!string(word);
                }
                else {
                        wordTable.require(key, Array!string()) ~= word;
                }
        }

        foreach (array; wordTable.values) {
                if (array.length == 4) {
                        foreach (word; array) {
                                write(word, ", ");
                        }
                        write("\n");
                        break;
                }
        }
}
Performing "debug" build using dmd for x86_64.
dbed ~master: building configuration "application"...
source/app.d(29,34): Error: template std.container.array.Array!string.Array.__ctor cannot deduce function from argument types !()(string), candidates are: /snap/dmd/99/bin/../import/phobos/std/container/array.d(467,5): __ctor(U)(U[] values...)
  with U = immutable(char)
  must satisfy the following constraint:
       isImplicitlyConvertible!(U, T)
/snap/dmd/99/bin/../import/phobos/std/container/array.d(501,5): __ctor(Range)(Range r)
  with Range = string
  must satisfy the following constraint:
       isImplicitlyConvertible!(ElementType!Range, T)
source/app.d(36,2): Warning: statement is not reachable
dmd failed with exit code 1.

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