panic when evaluating `p0m0mB2B`

[superhawk610]

Reproduction

I set up cargo-fuzz to test for inputs that would cause a panic. After 15 minutes or so, I came across this input, and was able to minimize it slightly (all of these result in a panic):

tpw0m0mB2B2e
tpw0m0mB2B
tp0m0mB2B
p0m0mB2B

Here's the fuzz target I used:

#![no_main]
use libfuzzer_sys::fuzz_target;
use smartcalc::SmartCalc;

fuzz_target!(|input: String| {
    eprintln!("FUZZ: {:?}", input);
    let calc = SmartCalc::default();
    let _ = calc.execute("en".to_string(), input);
});

Expected

Returns an error.

Actual

smartcalc = "1.0.7"

Panics with the following backtrace:

thread '<unnamed>' panicked at 'called `Option::unwrap()` on a `None` value', /home/aaron/code/smartcalc/src/compiler/dynamic_type.rs:160:161
stack backtrace:
   0: rust_begin_unwind
             at /rustc/8d60bf427a4b055f464122062e76b3ec34d4f8ba/library/std/src/panicking.rs:584:5
   1: core::panicking::panic_fmt
             at /rustc/8d60bf427a4b055f464122062e76b3ec34d4f8ba/library/core/src/panicking.rs:143:14
   2: core::panicking::panic
             at /rustc/8d60bf427a4b055f464122062e76b3ec34d4f8ba/library/core/src/panicking.rs:48:5
   3: <smartcalc::compiler::dynamic_type::DynamicTypeItem as smartcalc::compiler::DataItem>::calculate
   4: smartcalc::compiler::Interpreter::calculate_item
   5: smartcalc::compiler::Interpreter::executer_binary
   6: smartcalc::compiler::Interpreter::execute_ast
   7: smartcalc::compiler::Interpreter::executer_binary
   8: smartcalc::compiler::Interpreter::execute_ast
   9: smartcalc::smartcalc::SmartCalc::execute_text
  10: smartcalc::smartcalc::SmartCalc::execute_session
  11: smartcalc::smartcalc::SmartCalc::execute
  12: rust_fuzzer_test_input
  13: __rust_try
  14: LLVMFuzzerTestOneInput
  15: _ZN6fuzzer6Fuzzer15ExecuteCallbackEPKhm
  16: _ZN6fuzzer10RunOneTestEPNS_6FuzzerEPKcm
  17: _ZN6fuzzer12FuzzerDriverEPiPPPcPFiPKhmE
  18: main
  19: __libc_start_main
  20: _start

[erhanbaris]

The issue is fixed and it will be part of the v1.0.8 release.

[erhanbaris]

You can upgrade smartcalc-tui to v1.0.8.