Implement an in operator that returns true if the specified property is in the specified object

Usage:

set x = { "y": 1 }

"y" in x // true
"z" in z // false

error: failed to run custom build command for rust-crypto v0.2.36

Caused by: process didn't exit successfully: /data/data/com.termux/files/home/Ethereal/target/debug/build/rust-crypto-8f3ba42b89e8090a/build-script-build (exit status: 101) --- stdout TARGET = Some("armv7-linux-androideabi") OPT_LEVEL = Some("0") TARGET = Some("armv7-linux-androideabi") TARGET = Some("armv7-linux-androideabi") HOST = Some("armv7-linux-androideabi") CFLAGS_armv7-linux-androideabi = None CFLAGS_armv7_linux_androideabi = None HOST_CFLAGS = None CFLAGS = None DEBUG = Some("true") running: "cc" "-O0" "-ffunction-sections" "-fdata-sections" "-fPIC" "-g" "-march=armv7-a" "-march=armv7-a" "-mfpu=vfpv3-d16" "-mfloat-abi=softfp" "-Wall" "-Wextra" "-o" "/data/data/com.termux/files/home/Ethereal/target/debug/build/rust-crypto-474005083607c495/out/src/util_helpers.o" "-c" "src/util_helpers.c" exit status: 0 TARGET = Some("armv7-linux-androideabi") OPT_LEVEL = Some("0") TARGET = Some("armv7-linux-androideabi") TARGET = Some("armv7-linux-androideabi") HOST = Some("armv7-linux-androideabi") CFLAGS_armv7-linux-androideabi = None CFLAGS_armv7_linux_androideabi = None HOST_CFLAGS = None CFLAGS = None DEBUG = Some("true") running: "cc" "-O0" "-ffunction-sections" "-fdata-sections" "-fPIC" "-g" "-march=armv7-a" "-march=armv7-a" "-mfpu=vfpv3-d16" "-mfloat-abi=softfp" "-Wall" "-Wextra" "-o" "/data/data/com.termux/files/home/Ethereal/target/debug/build/rust-crypto-474005083607c495/out/src/aesni_helpers.o" "-c" "src/aesni_helpers.c" exit status: 0 TARGET = Some("armv7-linux-androideabi") TARGET = Some("armv7-linux-androideabi") HOST = Some("armv7-linux-androideabi") AR_armv7-linux-androideabi = None AR_armv7_linux_androideabi = None HOST_AR = None AR = None TARGET = Some("armv7-linux-androideabi") TARGET = Some("armv7-linux-androideabi") running: "arm-linux-androideabi-ar" "crs" "/data/data/com.termux/files/home/Ethereal/target/debug/build/rust-crypto-474005083607c495/out/lib_rust_crypto_helpers.a" "/data/data/com.termux/files/home/Ethereal/target/debug/build/rust-crypto-474005083607c495/out/src/util_helpers.o" "/data/data/com.termux/files/home/Ethereal/target/debug/build/rust-crypto-474005083607c495/out/src/aesni_helpers.o"

--- stderr thread 'main' panicked at '

Internal error occurred: Failed to find tool. Is arm-linux-androideabi-ar installed?

', /data/data/com.termux/files/home/.cargo/registry/src/github.com-1285ae84e5963aae/gcc-0.3.55/src/lib.rs:1672:5 note: run with RUST_BACKTRACE=1 environment variable to display a backtrace warning: build failed, waiting for other jobs to finish... error: build failed