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Redeclaration of a const identifier in a for-loop initialiser leads to panic #3206

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addisoncrump opened this issue Aug 9, 2023 · 0 comments · Fixed by #3207
Closed

Redeclaration of a const identifier in a for-loop initialiser leads to panic #3206

addisoncrump opened this issue Aug 9, 2023 · 0 comments · Fixed by #3207
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@addisoncrump
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Describe the bug
Any redeclaration of a const identifier in a for-loop initialiser leads to a panic, with any value.

To Reproduce

for (const b = 1, b = 0; ; ) {
}

You can replace the assignment of b with any value.

Expected behavior
This should trigger a syntax error:

for (const b = 1, b = 0; ; ) {
                  ^

SyntaxError: Identifier 'b' has already been declared
    at internalCompileFunction (node:internal/vm:73:18)
    at wrapSafe (node:internal/modules/cjs/loader:1178:20)
    at Module._compile (node:internal/modules/cjs/loader:1220:27)
    at Module._extensions..js (node:internal/modules/cjs/loader:1310:10)
    at Module.load (node:internal/modules/cjs/loader:1119:32)
    at Module._load (node:internal/modules/cjs/loader:960:12)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:81:12)
    at node:internal/main/run_main_module:23:47

Node.js v18.16.1

Build environment (please complete the following information):
N/A

Additional context
Discovered by bytecompiler-implied fuzzer.

@addisoncrump addisoncrump added the bug Something isn't working label Aug 9, 2023
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