Proofs

• expression state at time 52 = "iterate_args"
• arguments stack at time 52 = [ [ ], [ ] ]
• parent stack at time 52 = [ __mul__(value, 4), [ ] ]

then the expression at time 53 = __mul__(value, 4)

• expression state at time 52 = "iterate_args"
• arguments stack at time 52 = [ [ ], [ ] ]
• parent stack at time 52 = [ __mul__(value, 4), [ ] ]

then parent stack at time 53 = [ ]

• expression state at time 52 = "iterate_args"
• arguments stack at time 52 = [ [ ], [ ] ]
• parent stack at time 52 = [ __mul__(value, 4), [ ] ]

then arguments stack at time 53 = [ ]

• expression state at time 52 = "iterate_args"
• Value Stack at time 52 = [ [ 4, [ 3, [ ] ] ], [ ] ]

then Value Stack at time 53 = [ [ 4, [ 3, [ ] ] ], [ ] ]

• expression state at time 52 = "iterate_args"
• the line at time 52 = 3

then the line at time 53 = 3

• expression state at time 52 = "iterate_args"
• the tab at time 52 = 1

then the tab at time 53 = 1

• expression state at time 52 = "iterate_args"
• stack at time 52 = [ ]

then stack at time 53 = [ ]

• expression state at time 52 = "iterate_args"
• Python Object Store at time 52 = [ [1, 2, 3], [ ] ]

then Python Object Store at time 53 = [ [1, 2, 3], [ ] ]

• expression state at time 52 = "iterate_args"
• Control Map at time 52 = [ entry 0: (trio ("for", 2, [ ])), [ ] ]

then Control Map at time 53 = [ entry 0: (trio ("for", 2, [ ])), [ ] ]

• expression state at time 52 = "iterate_args"
• Variables Map at time 52 = [ entry numbers: (Python reference 0), [ entry value: 3, [ entry x: 8, [ ] ] ] ]

then Variables Map at time 53 = [ entry numbers: (Python reference 0), [ entry value: 3, [ entry x: 8, [ ] ] ] ]

• expression state at time 52 = "iterate_args"
• Class Map at time 52 = [ ]

then Class Map at time 53 = [ ]

• expression state at time 53 = "call_function_begin"
• the expression at time 53 = __mul__(value, 4)
• Python Object Store at time 53 = [ [1, 2, 3], [ ] ]

then Python Object Store at time 54 = [ [1, 2, 3], [ ] ]

• expression state at time 53 = "call_function_begin"
• Value Stack at time 53 = [ [ 4, [ 3, [ ] ] ], [ ] ]
• the expression at time 53 = __mul__(value, 4)

then Return Value at time 54 = 12

• expression state at time 53 = "call_function_begin"
• parent stack at time 53 = [ ]
• the expression at time 53 = __mul__(value, 4)

then expression state at time 54 = "end_expr"

• expression state at time 53 = "call_function_begin"
• Value Stack at time 53 = [ [ 4, [ 3, [ ] ] ], [ ] ]
• the expression at time 53 = __mul__(value, 4)

then Value Stack at time 54 = [ ]

• expression state at time 53 = "call_function_begin"
• arguments stack at time 53 = [ ]

then arguments stack at time 54 = [ ]

• expression state at time 53 = "call_function_begin"
• parent stack at time 53 = [ ]

then parent stack at time 54 = [ ]

• expression state at time 53 = "call_function_begin"
• Control Map at time 53 = [ entry 0: (trio ("for", 2, [ ])), [ ] ]

then Control Map at time 54 = [ entry 0: (trio ("for", 2, [ ])), [ ] ]

• expression state at time 53 = "call_function_begin"
• Variables Map at time 53 = [ entry numbers: (Python reference 0), [ entry value: 3, [ entry x: 8, [ ] ] ] ]

then Variables Map at time 54 = [ entry numbers: (Python reference 0), [ entry value: 3, [ entry x: 8, [ ] ] ] ]

• expression state at time 53 = "call_function_begin"
• the line at time 53 = 3

then the line at time 54 = 3

• expression state at time 53 = "call_function_begin"
• the tab at time 53 = 1

then the tab at time 54 = 1

• expression state at time 53 = "call_function_begin"
• stack at time 53 = [ ]

then stack at time 54 = [ ]

• expression state at time 53 = "call_function_begin"
• Class Map at time 53 = [ ]

then Class Map at time 54 = [ ]

• the line at time 54 = 3
• the tab at time 54 = 1
• statement at line 3, tab 1 = x = __mul__(value, 4)
• expression state at time 54 = "end_expr"
• Variables Map at time 54 = [ entry numbers: (Python reference 0), [ entry value: 3, [ entry x: 8, [ ] ] ] ]
• Return Value at time 54 = 12

then Variables Map at time 55 = [ entry numbers: (Python reference 0), [ entry value: 3, [ entry x: 12, [ ] ] ] ]

• the line at time 54 = 3
• the tab at time 54 = 1
• statement at line 3, tab 1 = x = __mul__(value, 4)
• expression state at time 54 = "end_expr"

then the line at time 55 = 4

• the line at time 54 = 3
• the tab at time 54 = 1
• statement at line 3, tab 1 = x = __mul__(value, 4)
• expression state at time 54 = "end_expr"

then the tab at time 55 = 1

• the line at time 54 = 3
• the tab at time 54 = 1
• statement at line 3, tab 1 = x = __mul__(value, 4)
• expression state at time 54 = "end_expr"
• Python Object Store at time 54 = [ [1, 2, 3], [ ] ]

then Python Object Store at time 55 = [ [1, 2, 3], [ ] ]

• the line at time 54 = 3
• the tab at time 54 = 1
• statement at line 3, tab 1 = x = __mul__(value, 4)
• stack at time 54 = [ ]
• expression state at time 54 = "end_expr"

then stack at time 55 = [ ]

• the line at time 54 = 3
• the tab at time 54 = 1
• statement at line 3, tab 1 = x = __mul__(value, 4)
• Control Map at time 54 = [ entry 0: (trio ("for", 2, [ ])), [ ] ]

then Control Map at time 55 = [ entry 0: (trio ("for", 2, [ ])), [ ] ]

• the line at time 54 = 3
• the tab at time 54 = 1
• statement at line 3, tab 1 = x = __mul__(value, 4)
• Class Map at time 54 = [ ]

then Class Map at time 55 = [ ]

• the line at time 55 = 4
• the tab at time 55 = 1
• number of lines = 3
• Control Map at time 55 = [ entry 0: (trio ("for", 2, [ ])), [ ] ]

then the line at time 56 = 2

• the line at time 55 = 4
• the tab at time 55 = 1
• number of lines = 3
• Control Map at time 55 = [ entry 0: (trio ("for", 2, [ ])), [ ] ]

then the tab at time 56 = 0

• the line at time 55 = 4
• the tab at time 55 = 1
• number of lines = 3
• Control Map at time 55 = [ entry 0: (trio ("for", 2, [ ])), [ ] ]
• Variables Map at time 55 = [ entry numbers: (Python reference 0), [ entry value: 3, [ entry x: 12, [ ] ] ] ]

then Variables Map at time 56 = [ entry numbers: (Python reference 0), [ entry value: 3, [ entry x: 12, [ ] ] ] ]

• the line at time 55 = 4
• the tab at time 55 = 1
• number of lines = 3
• Control Map at time 55 = [ entry 0: (trio ("for", 2, [ ])), [ ] ]
• stack at time 55 = [ ]

then stack at time 56 = [ ]

• the line at time 55 = 4
• the tab at time 55 = 1
• number of lines = 3
• Control Map at time 55 = [ entry 0: (trio ("for", 2, [ ])), [ ] ]
• Python Object Store at time 55 = [ [1, 2, 3], [ ] ]

then Python Object Store at time 56 = [ [1, 2, 3], [ ] ]

• the line at time 55 = 4
• the tab at time 55 = 1
• number of lines = 3
• Control Map at time 55 = [ entry 0: (trio ("for", 2, [ ])), [ ] ]

then Control Map at time 56 = [ entry 0: (trio ("for", 2, [ ])), [ ] ]

• the line at time 55 = 4
• the tab at time 55 = 1
• number of lines = 3
• Control Map at time 55 = [ entry 0: (trio ("for", 2, [ ])), [ ] ]
• Class Map at time 55 = [ ]

then Class Map at time 56 = [ ]

• the line at time 56 = 2
• the tab at time 56 = 0
• statement at line 2, tab 0 = for value in numbers:
• Control Map at time 56 = [ entry 0: (trio ("for", 2, [ ])), [ ] ]

then the line at time 57 = 3

• the line at time 56 = 2
• the tab at time 56 = 0
• statement at line 2, tab 0 = for value in numbers:
• Control Map at time 56 = [ entry 0: (trio ("for", 2, [ ])), [ ] ]

then the tab at time 57 = 0

• the line at time 56 = 2
• the tab at time 56 = 0
• statement at line 2, tab 0 = for value in numbers:
• Control Map at time 56 = [ entry 0: (trio ("for", 2, [ ])), [ ] ]

then expression state at time 57 = "not_expr"

• the line at time 56 = 2
• the tab at time 56 = 0
• statement at line 2, tab 0 = for value in numbers:
• Control Map at time 56 = [ entry 0: (trio ("for", 2, [ ])), [ ] ]
• stack at time 56 = [ ]

then stack at time 57 = [ ]

• the line at time 56 = 2
• the tab at time 56 = 0
• statement at line 2, tab 0 = for value in numbers:
• Control Map at time 56 = [ entry 0: (trio ("for", 2, [ ])), [ ] ]
• Python Object Store at time 56 = [ [1, 2, 3], [ ] ]

then Python Object Store at time 57 = [ [1, 2, 3], [ ] ]

• the line at time 56 = 2
• the tab at time 56 = 0
• statement at line 2, tab 0 = for value in numbers:
• Control Map at time 56 = [ entry 0: (trio ("for", 2, [ ])), [ ] ]
• Variables Map at time 56 = [ entry numbers: (Python reference 0), [ entry value: 3, [ entry x: 12, [ ] ] ] ]

then Variables Map at time 57 = [ entry numbers: (Python reference 0), [ entry value: 3, [ entry x: 12, [ ] ] ] ]

• the line at time 56 = 2
• the tab at time 56 = 0
• statement at line 2, tab 0 = for value in numbers:
• Control Map at time 56 = [ entry 0: (trio ("for", 2, [ ])), [ ] ]
• Class Map at time 56 = [ ]

then Class Map at time 57 = [ ]

• the line at time 56 = 2
• the tab at time 56 = 0
• statement at line 2, tab 0 = for value in numbers:
• Control Map at time 56 = [ entry 0: (trio ("for", 2, [ ])), [ ] ]

then Control Map at time 57 = [ entry 0: (trio ("for", 2, [ ])), [ ] ]

• the line at time 57 = 3
• the tab at time 57 = 0
• statement at line 3, tab 1 = x = value * 4

then the line at time 58 = 4

• the line at time 57 = 3
• the tab at time 57 = 0
• statement at line 3, tab 1 = x = value * 4

then the tab at time 58 = 0

• the line at time 57 = 3
• the tab at time 57 = 0
• statement at line 3, tab 1 = x = value * 4
• Variables Map at time 57 = [ entry numbers: (Python reference 0), [ entry value: 3, [ entry x: 12, [ ] ] ] ]

then Variables Map at time 58 = [ entry numbers: (Python reference 0), [ entry value: 3, [ entry x: 12, [ ] ] ] ]

• the line at time 57 = 3
• the tab at time 57 = 0
• statement at line 3, tab 1 = x = value * 4
• stack at time 57 = [ ]

then stack at time 58 = [ ]

• the line at time 57 = 3
• the tab at time 57 = 0
• statement at line 3, tab 1 = x = value * 4
• Python Object Store at time 57 = [ [1, 2, 3], [ ] ]

then Python Object Store at time 58 = [ [1, 2, 3], [ ] ]

• the line at time 57 = 3
• the tab at time 57 = 0
• statement at line 3, tab 1 = x = value * 4
• Control Map at time 57 = [ entry 0: (trio ("for", 2, [ ])), [ ] ]

then Control Map at time 58 = [ entry 0: (trio ("for", 2, [ ])), [ ] ]

• the line at time 57 = 3
• the tab at time 57 = 0
• statement at line 3, tab 1 = x = value * 4
• Class Map at time 57 = [ ]

then Class Map at time 58 = [ ]

• the line at time 57 = 3
• the tab at time 57 = 0
• statement at line 3, tab 1 = x = value * 4

then expression state at time 58 = "not_expr"

• the line at time 0 = 1
• the tab at time 0 = 0
• statement at line 1, tab 0 = numbers = [4, 7]
• expression state at time 0 = "not_expr"

then the expression at time 1 = [4, 7]

• the line at time 0 = 1
• the tab at time 0 = 0
• statement at line 1, tab 0 = numbers = [4, 7]
• expression state at time 0 = "not_expr"

then expression state at time 1 = "begin_expr"

• the line at time 0 = 1
• the tab at time 0 = 0
• statement at line 1, tab 0 = numbers = [4, 7]
• expression state at time 0 = "not_expr"

then the line at time 1 = 1

• the line at time 0 = 1
• the tab at time 0 = 0
• statement at line 1, tab 0 = numbers = [4, 7]
• expression state at time 0 = "not_expr"

then the tab at time 1 = 0

• the line at time 0 = 1
• the tab at time 0 = 0
• statement at line 1, tab 0 = numbers = [4, 7]
• expression state at time 0 = "not_expr"

then Value Stack at time 1 = [ ]

• the line at time 0 = 1
• the tab at time 0 = 0
• statement at line 1, tab 0 = numbers = [4, 7]
• expression state at time 0 = "not_expr"

then parent stack at time 1 = [ ]

• the line at time 0 = 1
• the tab at time 0 = 0
• statement at line 1, tab 0 = numbers = [4, 7]
• expression state at time 0 = "not_expr"

then arguments stack at time 1 = [ ]

• the line at time 0 = 1
• the tab at time 0 = 0
• statement at line 1, tab 0 = numbers = [4, 7]
• expression state at time 0 = "not_expr"
• Variables Map at time 0 = [ ]

then Variables Map at time 1 = [ ]

• the line at time 0 = 1
• the tab at time 0 = 0
• statement at line 1, tab 0 = numbers = [4, 7]
• expression state at time 0 = "not_expr"
• stack at time 0 = [ ]

then stack at time 1 = [ ]

• the line at time 0 = 1
• the tab at time 0 = 0
• statement at line 1, tab 0 = numbers = [4, 7]
• expression state at time 0 = "not_expr"
• Python Object Store at time 0 = [ ]

then Python Object Store at time 1 = [ ]

• the line at time 0 = 1
• the tab at time 0 = 0
• statement at line 1, tab 0 = numbers = [4, 7]
• Control Map at time 0 = [ ]

then Control Map at time 1 = [ ]

• the line at time 0 = 1
• the tab at time 0 = 0
• statement at line 1, tab 0 = numbers = [4, 7]
• Class Map at time 0 = [ ]

then Class Map at time 1 = [ ]

• expression state at time 1 = "begin_expr"
• the expression at time 1 = [4, 7]
• Value Stack at time 1 = [ ]

then Value Stack at time 2 = [ [ ], [ ] ]

• expression state at time 1 = "begin_expr"
• the expression at time 1 = [4, 7]
• parent stack at time 1 = [ ]

then parent stack at time 2 = [ [4, 7], [ ] ]

• expression state at time 1 = "begin_expr"
• the expression at time 1 = [4, 7]
• arguments stack at time 1 = [ ]

then arguments stack at time 2 = [ [ 4, [ 7, [ ] ] ], [ ] ]

• expression state at time 1 = "begin_expr"
• the expression at time 1 = [4, 7]

then expression state at time 2 = "iterate_args"

• expression state at time 1 = "begin_expr"
• the expression at time 1 = [4, 7]

then the expression at time 2 = [4, 7]

• expression state at time 1 = "begin_expr"
• Variables Map at time 1 = [ ]

then Variables Map at time 2 = [ ]

• expression state at time 1 = "begin_expr"
• the line at time 1 = 1

then the line at time 2 = 1

• expression state at time 1 = "begin_expr"
• the tab at time 1 = 0

then the tab at time 2 = 0

• expression state at time 1 = "begin_expr"
• stack at time 1 = [ ]

then stack at time 2 = [ ]

• expression state at time 1 = "begin_expr"
• Python Object Store at time 1 = [ ]

then Python Object Store at time 2 = [ ]

• expression state at time 1 = "begin_expr"
• Control Map at time 1 = [ ]

then Control Map at time 2 = [ ]

• expression state at time 1 = "begin_expr"
• Class Map at time 1 = [ ]

then Class Map at time 2 = [ ]

• expression state at time 2 = "iterate_args"
• arguments stack at time 2 = [ [ 4, [ 7, [ ] ] ], [ ] ]

then the expression at time 3 = 4

• expression state at time 2 = "iterate_args"
• arguments stack at time 2 = [ [ 4, [ 7, [ ] ] ], [ ] ]

then arguments stack at time 3 = [ [ 7, [ ] ], [ ] ]

• expression state at time 2 = "iterate_args"
• arguments stack at time 2 = [ [ 4, [ 7, [ ] ] ], [ ] ]

then expression state at time 3 = "begin_expr"

• expression state at time 2 = "iterate_args"
• arguments stack at time 2 = [ [ 4, [ 7, [ ] ] ], [ ] ]
• parent stack at time 2 = [ [4, 7], [ ] ]

then parent stack at time 3 = [ [4, 7], [ ] ]

• expression state at time 2 = "iterate_args"
• Value Stack at time 2 = [ [ ], [ ] ]

then Value Stack at time 3 = [ [ ], [ ] ]

• expression state at time 2 = "iterate_args"
• the line at time 2 = 1

then the line at time 3 = 1

• expression state at time 2 = "iterate_args"
• the tab at time 2 = 0

then the tab at time 3 = 0

• expression state at time 2 = "iterate_args"
• stack at time 2 = [ ]

then stack at time 3 = [ ]

• expression state at time 2 = "iterate_args"
• Python Object Store at time 2 = [ ]

then Python Object Store at time 3 = [ ]

• expression state at time 2 = "iterate_args"
• Control Map at time 2 = [ ]

then Control Map at time 3 = [ ]

• expression state at time 2 = "iterate_args"
• Variables Map at time 2 = [ ]

then Variables Map at time 3 = [ ]

• expression state at time 2 = "iterate_args"
• Class Map at time 2 = [ ]

then Class Map at time 3 = [ ]

• the expression at time 3 = 4
• expression state at time 3 = "begin_expr"
• 4 is constant
• parent stack at time 3 = [ [4, 7], [ ] ]

then expression state at time 4 = "return"

• the expression at time 3 = 4
• expression state at time 3 = "begin_expr"
• 4 is constant
• Value Stack at time 3 = [ [ ], [ ] ]

then Value Stack at time 4 = [ [ ], [ ] ]

• the expression at time 3 = 4
• expression state at time 3 = "begin_expr"
• 4 is constant
• arguments stack at time 3 = [ [ 7, [ ] ], [ ] ]

then arguments stack at time 4 = [ [ 7, [ ] ], [ ] ]

• expression state at time 3 = "begin_expr"
• the expression at time 3 = 4
• 4 is constant

then Return Value at time 4 = 4

• expression state at time 3 = "begin_expr"
• the expression at time 3 = 4
• 4 is constant
• parent stack at time 3 = [ [4, 7], [ ] ]

then parent stack at time 4 = [ [4, 7], [ ] ]