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./main.go:<n>:<n>: undefined: <name>

Not confirmed yet · posted

Cause

go run main.go compiles a package made of exactly the files named on the command line, so identifiers declared in the package's other .go files are missing.

Fix

risk: low

go run .            # compile the whole package in this directorygo run ./cmd/<app>  # or name the package directory

Don’t try

go build main.go — same file-list rule: it compiles only main.go and fails identically.

go run *.go — works only until the directory has a _test.go file: the glob passes it too and go stops with go: cannot run *_test.go files (<file>).

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