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  1. let x = "abc" # 新たな変数`x`を宣言し、値と結びつける
  2. x = "xyz" # 不正な操作: `x`への代入
Compilation error #stdin compilation error #stdout 0s 0KB
stdin
Standard input is empty
compilation info
prog.nim(2, 1) Error: 'x' cannot be assigned to
stdout
Standard output is empty