structure members are not displayed in suggestions when used in an arithmetic expression after a + or a -.

[surify]

operating system: xubuntu 16.04.1
vscode version: 1.22.2(I am not using insiders build)
C/C++ extension version: 0.16.1
The only extension I have installed currently is this(C/C++).
Example Code Sample:

#include <stdio.h>

typedef struct
{
    char name[30];
    char gender;
    int rollno;
    int marks;
}student;

int main(void)
{
    student s;
    int i, j, k, l;
    i = 5 - s.rollno;
    j = s.marks;
    k = 5 * s.rollno;
    l = 5 + 3 * s.rollno;
    return 0;
}

In the above example after declaring s to be of type student, in the assignment of i after I type "5 - s.", no suggestions are shown. but in the next line on assignment of j, as soon as i type " s. " all members of s are shown. same is the case with assignment to k. But in the assignment to l, as there is a + in the expression before using the structure member no suggestions are shown after typing " s. "

The structure member suggestion is working perfectly fine everywhere else like direct assignment, function parameters, etc except when used in an arithmetic expression after(not just immediately after) a + or a -.

After hitting " s. " in an expression after a + or a - no suggestions are shown automatically. If I hit ctrl+space then the members of the structure s are shown along with all variables and keywords in the code.

If the structure is defined in another header file and #included in this file, the members are not shown after I type " s. " and hit ctrl+enter. To make it clear this is only occurring only if a + or a - is in the arithmetic expression before the use of the structure member.

I have even tried completely uninstalling vscode from the computer.

1. sudo apt purge code
2. Deleted .vscode directory from my home directory.
3. Deleted Code directory from ./config.

After the reinstall, it looked like fresh install. I installed only C/C++ extension. But the issue is the same.

linux related settings from c_cpp_properties.json
{
"name": "Linux",
"includePath": [
"${workspaceFolder}",
"/usr/include/c++/5",
"/usr/include/x86_64-linux-gnu/c++/5",
"/usr/include/c++/5/backward",
"/usr/lib/llvm-5.0/lib/clang/5.0.0/include",
"/usr/local/include",
"/usr/include/x86_64-linux-gnu",
"/usr/include"
],
"defines": [],
"intelliSenseMode": "clang-x64",
"browse": {
"path": [
"${workspaceFolder}",
"/usr/include/c++/5",
"/usr/include/x86_64-linux-gnu/c++/5",
"/usr/include/c++/5/backward",
"/usr/lib/llvm-5.0/lib/clang/5.0.0/include",
"/usr/local/include",
"/usr/include/x86_64-linux-gnu",
"/usr/include"
],
"limitSymbolsToIncludedHeaders": true,
"databaseFilename": ""
},
"compilerPath": "/usr/bin/clang",
"cStandard": "c11",
"cppStandard": "c++17"
}

Please help me.

[bobbrow]

Sounds like a bug. I didn't see the problem you describe when I tried it, but we can look into it further. Just checking... did you change the "editor.quickSuggestions" setting at all or are you using VS Code's default? That will determine which behavior I should look for.

[surify]

I am using the VS code's default. I even checked by installing vscode on xubuntu 16.04.1 live. I installed only the C/C++ extension. Same issue exists. Its strange that it is happening with only + and -.

[surify]

I just tested on Linux Mint 18.2 xfce live(It is based on ubuntu 16.04.1) and the issue is not there. Everything is working great here.

[bobbrow]

Perhaps the extension is not running at all on your other machine? Can you set "C_Cpp.loggingLevel": "6" and see if anything shows up in the C/C++ channel of the Output Window (or if the C/C++ channel even exists)?

[surify]

Pardon me but I don't know what a C/C++ channel is. But when I set the "C_Cpp.loggingLevel" to "6",
an error showed up in its problem window saying that value not accepted. If that helps.

[surify]

I have a small doubt sir.
If the extension is not at all running on my machine, then why does it work at all. Why only fail if there is a + or - before it in the arithmetic expression. It is working fine everywhere else like function parameters and direct assignments.

[bobbrow]

You can ignore the error about "6". It's a hidden value that we only use for debugging issues. You should delete it when we're done because it logs a lot more information that you normally need.

This is what I mean by the "channel"

VS Code provides auto complete in some cases based on the text in your file, so I'm trying to see if that's what you're getting or not.

[surify]

Yeah, I have a C/C++ channel

[surify]

If it helps, the below message appeared in c/c++ channel after I set C_Cpp.loggingLevel to its default.

$/setTraceNotification
workspace/didChangeConfiguration
IntelliSense Engine = Default.
The extension will use the Tag Parser for IntelliSense when #includes don't resolve.
Autocomplete is enabled.
Error squiggles are enabled.

[sean-mcmanus]

This sounds the same as #2184 . We had a bug were edits randomly weren't being processed before the completion request. Let us know if this still repros after we ship 0.17.6.

[surify]

sure

[sean-mcmanus]

Should be fixed with 0.17.6.

[sean-mcmanus]

The issue with C files was fixed with https://github.com/microsoft/vscode-cpptools/releases/tag/0.30.0-insiders4 .