gopls check subcommant now accepts a -severity flag to set a minimum severity for the diagnostics it reports. By default, the minimum severity is “warning”, so gopls check may report fewer diagnostics than before. Set -severity=hint to reproduce the previous behavior.The Implementations query reports the correspondence between abstract and concrete types and their methods based on their method sets. Now, it also reports the correspondence between function types, dynamic function calls, and function definitions, based on their signatures.
To use it, invoke an Implementations query on the func token of the definition of a named function, named method, or function literal. Gopls reports the set of function signature types that abstract this function, and the set of dynamic calls through values of such types.
Conversely, an Implementations query on the func token of a signature type, or on the ( paren of a dynamic function call, reports the set of concrete functions that the signature abstracts or that the call dispatches to.
Since a type may be both a function type and a named type with methods (for example, http.HandlerFunc), it may participate in both kinds of Implements queries (method-sets and function signatures). Queries using method-sets should be invoked on the type or method name, and queries using signatures should be invoked on a func or ( token.
Only the local (same-package) algorithm is currently supported. TODO: implement global.
This code action, available on a dotted import, will offer to replace the import with a regular one and qualify each use of the package with its name.