gopls isn't emitting warnings

[sbromberger]

What version of Go are you using (go version)?

go version go1.12.1 darwin/amd64

Does this issue reproduce with the latest release?

yes

What operating system and processor architecture are you using (go env)?

go env Output

seth@snoopy:~/dev/go/src/github.com/sbromberger/test$ go env
GOARCH="amd64"
GOBIN=""
GOCACHE="/Users/seth/Library/Caches/go-build"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="/Users/seth/dev/go"
GOPROXY=""
GORACE=""
GOROOT="/usr/local/Cellar/go/1.12.1/libexec"
GOTMPDIR=""
GOTOOLDIR="/usr/local/Cellar/go/1.12.1/libexec/pkg/tool/darwin_amd64"
GCCGO="gccgo"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD=""
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/2s/2yph0ncn3cd9myvzw2cn8l_w0000gn/T/go-build449639304=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

started gopls via vim-lsp with -logfile /tmp/gopls.log and opened a file with the following code: https://play.golang.org/p/h-brfsSp7cj

What did you expect to see?

I expected to see gopls notify of one error (line 11) and one warning (line 6).

What did you see instead?

Error was detected; warning was not:

[Trace - 12:17:24 PM] Sending request 'initialize - (1)'.
Params: {"rootUri":"file:///Users/seth/dev/go/src/github.com/sbromberger/test","capabilities":{"workspace":{"applyEdit ":true}},"rootPath":"/Users/seth/dev/go/src/github.com/sbromberger/test","processId":17906,"trace":"off"}


[Trace - 12:17:24 PM] Received response 'initialize - (1)' in 1ms.
Params: {"capabilities":{"textDocumentSync":{"openClose":true,"change":1},"hoverProvider":true,"completionProvider":{"triggerCharacters":["."]},"signatureHelpProvider":{"triggerCharacters":["(",","]},"definitionProvider":true,"codeActionProvider":true,"documentFormattingProvider":true,"documentRangeFormattingProvider":true,"typeDefinitionProvider":true},"custom":null}


[Trace - 12:17:24 PM] Sending notification 'initialized'.
Params: {}


[Trace - 12:17:24 PM] Sending notification 'textDocument/didOpen'.
Params: {"textDocument":{"uri":"file:///Users/seth/dev/go/src/github.com/sbromberger/test/test.go","version":1,"languageId":"go","text":"package main\n\nfunc test(a int) bool {\n\tif a == 5 {\n\t\treturn true\n\t} else {\n\t\treturn false\n\t}\n}\nfunc main() {\n\ta := 6\n}\n"}}


[Trace - 12:17:24 PM] Received notification 'textDocument/publishDiagnostics'.
Params: {"uri":"file:///Users/seth/dev/go/src/github.com/sbromberger/test/test.go","diagnostics":[{"range":{"start":{"line":10,"character":1},"end":{"line":10,"character":2}},"severity":1,"source":"LSP","message":"a declared but not used"}]}

[sbromberger]

After discussion with @stamblerre , I understand that gopls does not (yet?) support linting. This is why the warning isn't showing up.