Build fails with error[E0642]: patterns aren't allowed in functions without bodies

[MorgenAnSpyrys]

Terminal output as follows

PowerShell 7.3.1
PS C:\Users\win10laptop\Dev\rust> git clone https://github.com/Coeuvre/rust-2048.git
Cloning into 'rust-2048'...
remote: Enumerating objects: 358, done.
remote: Total 358 (delta 0), reused 0 (delta 0), pack-reused 358
Receiving objects: 100% (358/358), 378.48 KiB | 2.44 MiB/s, done.
Resolving deltas: 100% (224/224), done.
PS C:\Users\win10laptop\Dev\rust> cd .\rust-2048
PS C:\Users\win10laptop\Dev\rust\rust-2048> cargo run
Updating crates.io index
Downloaded adler32 v1.2.0
Downloaded linked-hash-map v0.5.6
Downloaded nodrop v0.1.14
Downloaded rand v0.3.14
Downloaded piston v0.27.0
Downloaded gfx_device_gl v0.12.0
Downloaded piston-shaders_graphics2d v0.1.0
Downloaded num_cpus v0.2.13
Downloaded piston-gfx_texture v0.20.0
Downloaded pistoncore-glutin_window v0.33.0
Downloaded piston-texture v0.5.0
Downloaded sdl2 v0.27.3
Downloaded pistoncore-sdl2_window v0.38.0
Downloaded vecmath v0.2.0
Downloaded xml-rs v0.3.4
Downloaded rustc-serialize v0.3.19
Downloaded winapi-build v0.1.1
Downloaded gfx_core v0.5.1
Downloaded lazy_static v0.2.11
Downloaded winapi v0.2.8
Downloaded num-rational v0.1.35
Downloaded gl v0.6.1
Downloaded khronos_api v0.0.8
Downloaded enum_primitive v0.1.0
Downloaded gif v0.9.2
Downloaded winit v0.5.11
Downloaded dwmapi-sys v0.1.0
Downloaded piston2d-graphics v0.19.0
Downloaded interpolation v0.1.0
Downloaded bitflags v0.6.0
Downloaded piston2d-gfx_graphics v0.35.0
Downloaded user32-sys v0.1.2
Downloaded color_quant v1.0.0
Downloaded pistoncore-event_loop v0.27.0
Downloaded shared_library v0.1.5
Downloaded piston-viewport v0.2.0
Downloaded bitflags v0.7.0
Downloaded piston-float v0.2.0
Downloaded rayon v0.4.0
Downloaded pistoncore-window v0.24.0
Downloaded num-integer v0.1.32
Downloaded shell32-sys v0.1.1
Downloaded gl_generator v0.5.2
Downloaded num-traits v0.1.35
Downloaded gdi32-sys v0.1.1
Downloaded pistoncore-input v0.15.0
Downloaded sdl2-sys v0.27.3
Downloaded gfx_gl v0.3.1
Downloaded num v0.1.35
Downloaded glutin v0.7.4
Downloaded log v0.3.6
Downloaded deque v0.3.1
Downloaded stb_truetype v0.2.0
Downloaded time v0.1.35
Downloaded rusttype v0.2.4
Downloaded scoped_threadpool v0.1.7
Downloaded piston2d-opengl_graphics v0.37.0
Downloaded khronos_api v1.0.0
Downloaded jpeg-decoder v0.1.6
Downloaded byteorder v0.4.2
Downloaded num-iter v0.1.32
Downloaded fnv v1.0.4
Downloaded libc v0.2.15
Downloaded gfx v0.13.0
Downloaded draw_state v0.6.0
Downloaded byteorder v1.4.3
Downloaded png v0.6.2
Downloaded deflate v0.7.20
Downloaded byteorder v0.5.3
Downloaded arrayvec v0.4.12
Downloaded read_color v0.1.0
Downloaded shader_version v0.2.1
Downloaded piston-shaders_graphics2d v0.2.1
Downloaded piston_window v0.61.0
Downloaded kernel32-sys v0.2.2
Downloaded inflate v0.1.1
Downloaded image v0.12.4
Downloaded lzw v0.10.0
Downloaded 78 crates (4.9 MB) in 2.70s
Compiling bitflags v0.7.0
Compiling winapi-build v0.1.1
Compiling libc v0.2.15
Compiling log v0.3.6
Compiling khronos_api v1.0.0
Compiling num-traits v0.1.35
Compiling piston-float v0.2.0
Compiling winapi v0.2.8
Compiling shader_version v0.2.1
Compiling lazy_static v0.2.11
Compiling byteorder v1.4.3
Compiling bitflags v0.6.0
Compiling xml-rs v0.3.4
Compiling piston-viewport v0.2.0
Compiling rand v0.3.14
Compiling num_cpus v0.2.13
Compiling rustc-serialize v0.3.19
Compiling gdi32-sys v0.1.1
Compiling adler32 v1.2.0
Compiling draw_state v0.6.0
Compiling inflate v0.1.1
error[E0642]: patterns aren't allowed in functions without bodies
--> C:\Users\win10laptop.cargo\registry\src\github.com-1ecc6299db9ec823\rustc-serialize-0.3.19\src\serialize.rs:147:45
|
147 | ... &f_name: &str,
| ^^^^^^^ pattern not allowed in function without body

Compiling kernel32-sys v0.2.2
Compiling user32-sys v0.1.2
Compiling num-integer v0.1.32
Compiling gl_generator v0.5.2
Compiling deque v0.3.1
Compiling num-iter v0.1.32
Compiling shell32-sys v0.1.1
Compiling dwmapi-sys v0.1.0
Compiling num v0.1.35
Compiling rayon v0.4.0
Compiling deflate v0.7.20
For more information about this error, try rustc --explain E0642.
Compiling byteorder v0.5.3
Compiling color_quant v1.0.0
error: could not compile rustc-serialize due to previous error
warning: build failed, waiting for other jobs to finish...
PS C:\Users\win10laptop\Dev\rust\rust-2048> cargo build
Compiling rustc-serialize v0.3.19
Compiling kernel32-sys v0.2.2
Compiling gl v0.6.1
Compiling lzw v0.10.0
Compiling arrayvec v0.4.12
Compiling gfx_core v0.5.1
Compiling num-rational v0.1.35
Compiling byteorder v0.4.2
Compiling enum_primitive v0.1.0
Compiling jpeg-decoder v0.1.6
Compiling png v0.6.2
Compiling piston-texture v0.5.0
error[E0642]: patterns aren't allowed in functions without bodies
--> C:\Users\win10laptop.cargo\registry\src\github.com-1ecc6299db9ec823\rustc-serialize-0.3.19\src\serialize.rs:147:45
|
147 | ... &f_name: &str,
| ^^^^^^^ pattern not allowed in function without body

Compiling gif v0.9.2
Compiling nodrop v0.1.14
Compiling scoped_threadpool v0.1.7
Compiling stb_truetype v0.2.0
Compiling user32-sys v0.1.2
Compiling image v0.12.4
Compiling shell32-sys v0.1.1
Compiling dwmapi-sys v0.1.0
For more information about this error, try rustc --explain E0642.
error: could not compile rustc-serialize due to previous error
warning: build failed, waiting for other jobs to finish...

[dvnDC]

I got the same error.
rustc --explain E0642 is:
Trait methods currently cannot take patterns as arguments.

Erroneous code example:

trait Foo {
    fn foo((x, y): (i32, i32)); // error: patterns aren't allowed
                                //        in trait methods
}

You can instead use a single name for the argument:

trait Foo {
    fn foo(x_and_y: (i32, i32)); // ok!
}

[tormol]

This is a duplicate of #30, which is fixed by #31 or #32.

Deleting Cargo.lock is enough to fix this locally, because cargo then uses a newer version of that dependency.

But that still leaves one with an immediate runtime panic, which is fixed by #40.