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Fix a check for empty input in macroexpand

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The equality check hasn't done the right thing since HyExpression became tuple-backed (#1804).
This commit is contained in:
Kodi Arfer 2020-03-20 12:56:49 -04:00
parent 2ed1e8b8e7
commit 48d481b5d3
2 changed files with 3 additions and 4 deletions
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2
NEWS.rst
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@ -13,6 +13,8 @@ Bug Fixes
* Improved support for nesting anaphoric macros by only applying * Improved support for nesting anaphoric macros by only applying
symbol replacement where absolutely necessary. symbol replacement where absolutely necessary.
* Quoted f-strings are no longer evaluated prematurely. * Quoted f-strings are no longer evaluated prematurely.
* Fixed a regression in the production of error messages for empty
expressions.
0.18.0 0.18.0
============================== ==============================

5
hy/macros.py
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@ -308,10 +308,7 @@ def macroexpand(tree, module, compiler=None, once=False):
assert not compiler or compiler.module == module assert not compiler or compiler.module == module
while True: while isinstance(tree, HyExpression) and tree:
if not isinstance(tree, HyExpression) or tree == []:
break
fn = tree[0] fn = tree[0]
if fn in ("quote", "quasiquote") or not isinstance(fn, HySymbol): if fn in ("quote", "quasiquote") or not isinstance(fn, HySymbol):