For a given line, Go prints the same error only once. For example, trying to use the same unknown field in a struct initialiser multiple times will only emit one error, if that struct initialiser is written on a single line. However, each suppressed error still increments the error counter in Yyerror, which can lead to a "too many errors" even if just one error was actually printed. This can be mildly confusing, and reduces the usefulness of deduplication.

Input
http://play.golang.org/p/S18DnIr63o

package main

type T struct{}

func main() {
    t := T{X: 1, X: 1, X: 1, X: 1, X: 1, X: 1, X: 1, X: 1, X: 1, X: 1}
    var s string = 1
}

Output

prog.go:6: unknown T field 'X' in struct literal
prog.go:6: too many errors

Expected output

prog.go:6: unknown T field 'X' in struct literal
prog.go:7: cannot use 1 (type int) as type string in assignment