Debugger crashes when entering separate file in debug mode

• [* ] I’ve asked for help in the Truffle Gitter before filing this issue.

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Issue

truffle debug <txn> enters the debugger however it crashes when entering a new file.

Steps to Reproduce

Try debugging a transaction in which the debugger has to step through multiple files.

Expected Behavior

Debugger should continue normally.

Actual Results

AFXCrowdsale.sol: is the entry point, AFXToken.sol is a separate file.

AFXCrowdsale.sol:

79:   function () external payable {
80:     uint256 tokensThatWillBeMintedAfterPurchase = msg.value.mul(rate);
81:     if ((stage == CrowdsaleStage.PreICO) && (token.totalSupply() + tokensThatWillBeMintedAfterPurchase > totalTokensForSaleDuringPreICO)) {
                                                 ^^^^^^^^^^^^^^^^^^^                                                                           

debug(development:0xc6ead1d6...)> 

AFXToken.sol:

TypeError: Cannot read property 'line' of undefined

Environment

• Operating System: Ubuntu 16.04
• Ethereum client: geth 1.8.1-stable
• Truffle version:

Truffle v4.1.0 (core: 4.1.0)
Solidity v0.4.19 (solc-js)

• node version:v8.9.1
• npm version: 5.5.1

Workaround

Use a flattener, compile and debug from a single large file:

truffle-flattener contracts/crowdsale/AFXCrowdsale.sol | pbcopy etc.

[gnidan]

I think this should be fixed when trufflesuite/truffle-debugger#39 goes out in the next release!

Closing for cleanup reasons. Thanks!

[cgewecke]

@boorac Thanks yes, clearly. Thanks for the work-around too, nice.