Quoted R system.file() in YAML header fails #1387
Description
If I use system.file() to refer to a file in the YAML header, rendering (with RStudio) fails:
---
title: "Header Test - !expr"
output:
word_document:
reference_docx: '`r system.file("templates", "reference_docx_landscape.docx", package = "psychmeta")`'
---
However, if I enter it as an R expression, it works (but evaluating expressions will apparently be disabled by default in the near future):
---
title: "Header Test - !expr"
output:
word_document:
reference_docx: !expr system.file("templates", "reference_docx_landscape.docx", package = "psychmeta")
---
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