Go: declared and not used: x / "fmt" imported and not used
Go refuses to compile code with unused local variables or unused imports.
Exact message you may see
declared and not usedimported and not useddeclared but not used
Seen on:
Go
Meaning
This keeps code clean, but is annoying while debugging. Use the variable, remove it, or assign to _; for imports, remove them or let goimports manage them automatically.
Common causes
- Variable assigned but never read
- Leftover import after editing code
- Shadowed variable with := inside a block
⚡ Quick fix
- Remove the variable/import
- Assign to the blank identifier _ while debugging
- Run goimports / gopls on save
Detailed fix by platform
Shell
- go
go install golang.org/x/tools/cmd/goimports@latest goimports -w .
How to diagnose
- Line — Variable/import named
- Shadowing — := inside if/for blocks?
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Last updated 15 Oct 2026