v8/test/message/fail/destructuring-undefined-number-property.out

*%(basename)s:5: TypeError: Cannot destructure 'undefined' or 'null'.
var { 1: x } = undefined;
    ^
TypeError: Cannot destructure 'undefined' or 'null'.
    at *%(basename)s:5:5
[parser] Better error message when destructuring against undefined/null Previously, when destructuring against null or undefined we would print: d8> var { x } = null (d8):1: TypeError: Cannot match against 'undefined' or 'null'. var { x } = null ^ TypeError: Cannot match against 'undefined' or 'null'. at (d8):1:1 The above message uses the term "match" which isn't a common term in JavaScript to describe destructuring. This message also doesn't provide the name of the property that fails destructuring. This patch changes the error message to be: d8> var { x } = null; (d8):1: TypeError: Cannot destructure property `x` of 'undefined' or 'null'. var { x } = null; ^ TypeError: Cannot destructure property `x` of 'undefined' or 'null'. at (d8):1:1 This patch changes the message to say "destructure" instead of "match". This patch adds support for printing property names that are string literals. We iterate through every property and pick the first string literal property name if it exists. This provides at least some feedback to the developer. This patch also makes the pointer point to the position of the property name that fails destructuring. For computed and numeric property names, we print a generic error: d8> var { 1: x } = null (d8):1: TypeError: Cannot destructure against 'undefined' or 'null'. var { 1: x } = null ^ TypeError: Cannot destructure against 'undefined' or 'null'. at (d8):1:1 Bug: v8:6499 Change-Id: I35b1ac749489828686f042975294b9926e2dfc53 Reviewed-on: https://chromium-review.googlesource.com/537341 Reviewed-by: Adam Klein <adamk@chromium.org> Commit-Queue: Sathya Gunasekaran <gsathya@chromium.org> Cr-Commit-Position: refs/heads/master@{#45965} 2017-06-15 21:24:37 +00:00			`*%(basename)s:5: TypeError: Cannot destructure 'undefined' or 'null'.`
			`var { 1: x } = undefined;`
			`^`
			`TypeError: Cannot destructure 'undefined' or 'null'.`
[parser] Don't desugar destructuring declarations. Emit a single destructuring assignment for destructuring declarations, which can be desugared by the bytecode generator. This allows us to remove destructuring desugaring from the parser (specifically, the pattern rewriter) entirely. The pattern "rewriter" is now only responsible for walking the destructuring pattern to declare variables, mark them assigned, and potentially rewrite scopes for the edge case of parameters with a sloppy eval. Note that since the rewriter is no longer rewriting, we have to flip the VariableProxy copying logic for var re-lookup, so that we now pass the new VariableProxy to the variable declaration and leave the original unresolved (rather than passing the original through and rewriting to a new unresolved VariableProxy). This change does have some effect on breakpoint locations, due to some of the available information changing between the parser and bytecode generator, however the new locations appear to be more consistent between assignments and declarations. Change-Id: I3a58dd0a387d2bfb8e5e9e22dde0acc5f440cb82 Reviewed-on: https://chromium-review.googlesource.com/c/1382462 Commit-Queue: Leszek Swirski <leszeks@chromium.org> Reviewed-by: Adam Klein <adamk@chromium.org> Reviewed-by: Ross McIlroy <rmcilroy@chromium.org> Reviewed-by: Yang Guo <yangguo@chromium.org> Reviewed-by: Toon Verwaest <verwaest@chromium.org> Cr-Commit-Position: refs/heads/master@{#58670} 2019-01-09 13:21:06 +00:00			`at *%(basename)s:5:5`