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go / go / 2e78447bafc2dfdfa8b75e01ca3e681741706bbc
commit2e78447bafc2dfdfa8b75e01ca3e681741706bbc[log] [tgz]
authorRuss Cox <rsc@golang.org>Fri Feb 06 13:48:42 2015 -0500
committerRuss Cox <rsc@golang.org>Fri Feb 13 17:29:36 2015 +0000
tree43586b33a54fa10e00e5f07254fc5540aa923a50
parent3be158d6ab73090a74df6bc3b7cfa062d896483a [diff]
cmd/yacc: adjust expansion of $n to be more useful in errors

When the compiler echoes back an expression, it shows the
generated yacc expression. Change the generated code to
use a slice so that $3 shows up as yyDollar[3] in such messages.

Consider changing testdata/expr/expr.y to say:

	$$.Sub(float64($1), $3)

(The float64 conversion is incorrect.)

Before:
expr.y:70[expr.go:486]: cannot convert exprS[exprpt - 2].num (type *big.Rat) to type float64

After:
expr.y:70[expr.go:492]: cannot convert exprDollar[1].num (type *big.Rat) to type float64

Change-Id: I74e494069df588e62299d1fccb282f3658d8f8f4
Reviewed-on: https://go-review.googlesource.com/4630
Reviewed-by: Rob Pike <r@golang.org>
1 file changed
tree: 43586b33a54fa10e00e5f07254fc5540aa923a50
  1. api/
  2. doc/
  3. include/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. CONTRIBUTING.md
  12. CONTRIBUTORS
  13. favicon.ico
  14. LICENSE
  15. PATENTS
  16. README.md
  17. robots.txt
README.md

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