build on save diagnostics broken when importing non-existent file

[leecannon]

Zig Version

0.14.0-dev.3239+d7b93c787

ZLS Version

0.14.0-dev.390+188a4c0

Client / Code Editor / Extensions

vscode

Steps to Reproduce and Observed Behavior

pub fn main() !void {
    const a: bool = 2;
    _ = a;
}

const t = @import("doesntexist.zig");

No diagnostic is shown for either invalid assignment to a or import of non-existent file.

If the const t = @import("doesntexist.zig"); is commented out then invalid assignment to a diagnostic is shown.

Expected Behavior

Diagnostics are shown including one about the file not existing.

Relevant log output

[Info  - 20:12:55] Starting ZLS      0.14.0-dev.390+188a4c0 @ '/home/lee/bin/zls'
[Info  - 20:12:55] Log File:         /home/lee/.cache/zls/zls.log (info)
[Info  - 20:12:55] Client Info:      Visual Studio Code-1.97.2
[Info  - 20:12:55] Autofix Mode:     source.fixall
Offset Encoding:  utf-16
[Info  - 20:12:55] added Workspace Folder: file:///home/lee/src/fresh
[Info  - 20:12:55] Set config option 'builtin_path' to "/home/lee/.cache/zls/builtin.zig"
[Info  - 20:12:55] Set config option 'zig_lib_path' to "/home/lee/zig/0.14.0-dev.3239+d7b93c787/files/lib"
[Info  - 20:12:55] Set config option 'zig_exe_path' to "/home/lee/bin/zig"
[Info  - 20:12:55] Set config option 'build_runner_path' to "/home/lee/.cache/zls/build_runner/9e5b9ae17ea1542863390dfab3c8a26c/build_runner.zig"
[Info  - 20:12:55] Set config option 'global_cache_path' to "/home/lee/.cache/zls"
Took 9ms to process request-0-initialize on Thread 55852
Dynamically registering method 'workspace/didChangeConfiguration'
Took 0ms to process request-17-shutdown on Thread 55574
Took 0ms to process notification-initialized on Thread 55852
[Info  - 20:12:55] Loaded build file 'file:///home/lee/src/fresh/build.zig'
Opened document 'file:///home/lee/src/fresh/src/main.zig'
Took 0ms to process notification-textDocument/didOpen on Thread 55852
Opened document 'file:///home/lee/src/fresh/build.zig' (build file)
Took 0ms to process notification-textDocument/didOpen on Thread 55852
Took 0ms to process response-"register-workspace/didChangeConfiguration" on Thread 55852
[Info  - 20:12:55] Set config option 'enable_build_on_save' to true
[Info  - 20:12:55] Set config option 'semantic_tokens' to "partial"
[Info  - 20:12:55] Set config option 'inlay_hints_show_builtin' to false
[Info  - 20:12:55] Set config option 'inlay_hints_hide_redundant_param_names' to true
[Info  - 20:12:55] Set config option 'inlay_hints_hide_redundant_param_names_last_token' to true
[Info  - 20:12:55] Set config option 'skip_std_references' to true
[Info  - 20:12:55] trying to start Build-On-Save for 'file:///home/lee/src/fresh'
Took 4ms to process response-"i_haz_configuration" on Thread 55852
Took 0ms to process request-1-textDocument/documentSymbol on Thread 55856
Took 0ms to process response-"progress" on Thread 55852
Took 0ms to process notification-other on Thread 55856
Took 0ms to process request-2-textDocument/documentSymbol on Thread 55854
[Error - 20:12:55] failed to read document '/home/lee/src/fresh/src/doesntexist.zig': error.FileNotFound
Took 0ms to process request-3-textDocument/inlayHint on Thread 55855
Took 0ms to process response-"semantic_tokens_refresh" on Thread 55852
Took 0ms to process response-"inlay_hints_refresh" on Thread 55852
[Error - 20:12:55] failed to read document '/home/lee/src/fresh/src/doesntexist.zig': error.FileNotFound
Took 0ms to process request-4-textDocument/semanticTokens/range on Thread 55856
Took 0ms to process request-5-textDocument/foldingRange on Thread 55853

[Techatrix]

Zig does not provide the error message with a source location. See ziglang/zig#22930