cmd/compile: more error position tests for the typechecker

This change adds line position tests for several yyerror calls in the
typechecker that are currently not tested in any way.

Untested yyerror calls were found by replacing them with

  yerrorl(src.NoXPos, ...)

(thus destroying position information in the error), and then running
the test suite. No failures means no test coverage for the relevant
yyerror call.

For #19683

Change-Id: Iedb3d2f02141b332e9bfa76dbf5ae930ad2fddc3
Reviewed-on: https://go-review.googlesource.com/41477
Run-TryBot: Alberto Donizetti <alb.donizetti@gmail.com>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/test/initializerr.go b/test/initializerr.go
index ca05414554..990ab60f96 100644
--- a/test/initializerr.go
+++ b/test/initializerr.go
@@ -23,6 +23,7 @@ var a2 = S { Y: 3, Z: 2, Y: 3 } // ERROR "duplicate"
 var a3 = T { S{}, 2, 3, 4, 5, 6 }	// ERROR "convert|too many"
 var a4 = [5]byte{ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 }	// ERROR "index|too many"
 var a5 = []byte { x: 2 }	// ERROR "index"
+var a6 = []byte{1: 1, 2: 2, 1: 3}	// ERROR "duplicate index"
 
 var ok1 = S { }	// should be ok
 var ok2 = T { S: ok1 }	// should be ok