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Add optional span to require_lang_item for diagnostics with more context #63954

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#63961
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Add optional span to require_lang_item for diagnostics with more context#63954
#63961
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A-diagnosticsArea: Messages for errors, warnings, and lintsA-lang-itemArea: Language itemsC-enhancementCategory: An issue proposing an enhancement or a PR with one.E-easyCall for participation: Easy difficulty. Experience needed to fix: Not much. Good first issue.T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.
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estebank
opened on Aug 27, 2019

fn require_lang_item(LangItem) should also take an optional Span to avoid output without context.

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    A-diagnosticsArea: Messages for errors, warnings, and lintsA-lang-itemArea: Language itemsC-enhancementCategory: An issue proposing an enhancement or a PR with one.E-easyCall for participation: Easy difficulty. Experience needed to fix: Not much. Good first issue.T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.

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