1007.lean:8:9-8:17: warning: declaration uses 'sorry'
1007.lean:9:9-9:20: warning: declaration uses 'sorry'
1007.lean:11:33-11:41: warning: declaration uses 'sorry'
1007.lean:15:9-15:20: warning: declaration uses 'sorry'
1007.lean:33:0-33:8: warning: declaration uses 'sorry'
1007.lean:34:0-34:8: warning: declaration uses 'sorry'
1007.lean:38:4-38:8: warning: declaration uses 'sorry'
1007.lean:39:4-39:7: warning: declaration uses 'sorry'
1007.lean:56:64-56:78: error: failed to synthesize
  IsLin fun x => sum fun i => norm x
Additional diagnostic information may be available using the `set_option diagnostics true` command.