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cmd/compile: avoid multiple errors regarding misuse of ... in signatures

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Follow-up on #28450 (golang.org/cl/152417).

Updates #28450.
Fixes #29107.

Change-Id: Ib4b4fe582c35315a4f71cf6dbc7f7f2f24b37ec1
Reviewed-on: https://go-review.googlesource.com/c/152758
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
This commit is contained in:
Robert Griesemer 2018-12-05 09:52:59 -08:00
parent 09f541173e
commit cd47e8944d
2 changed files with 7 additions and 5 deletions
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8
src/cmd/compile/internal/gc/noder.go
View File

@ -546,12 +546,14 @@ func (p *noder) param(param *syntax.Field, dddOk, final bool) *Node {
// rewrite ...T parameter
if typ.Op == ODDD {
if !dddOk {
yyerror("cannot use ... in receiver or result parameter list")
// We mark these as syntax errors to get automatic elimination
// of multiple such errors per line (see yyerrorl in subr.go).
yyerror("syntax error: cannot use ... in receiver or result parameter list")
} else if !final {
if param.Name == nil {
yyerror("cannot use ... with non-final parameter")
yyerror("syntax error: cannot use ... with non-final parameter")
} else {
p.yyerrorpos(param.Name.Pos(), "cannot use ... with non-final parameter %s", param.Name.Value)
p.yyerrorpos(param.Name.Pos(), "syntax error: cannot use ... with non-final parameter %s", param.Name.Value)
}
}
typ.Op = OTARRAY

4
test/fixedbugs/issue28450.go
View File

@ -6,13 +6,13 @@
package p
func f(a, b, c, d ...int) {} // ERROR "non-final parameter a" "non-final parameter b" "non-final parameter c"
func f(a, b, c, d ...int) {} // ERROR "non-final parameter a"
func g(a ...int, b ...int) {} // ERROR "non-final parameter a"
func h(...int, ...int, float32) {} // ERROR "non-final parameter"
type a func(...float32, ...interface{}) // ERROR "non-final parameter"
type b interface {
f(...int, ...int) // ERROR "non-final parameter"
g(a ...int, b ...int, c float32) // ERROR "non-final parameter a" "non-final parameter b"
g(a ...int, b ...int, c float32) // ERROR "non-final parameter a"
valid(...int)
}