*** Description: sometimes `export` is greedy with }, sometimes not. ***

When using `export name=$(command)` inside a function, different behaviours can be noticed :

> `function foo1(){export bar1=$(echo 'Any-command-here')}`
* valid when executed
* valid when sourced in zsh 5.0.8-1
* invalid when sourced in zsh 5.1.1-1

> `function foo1(){export bar1=$(echo 'Any-command-here')} }`
* invalid when executed
* invalid when sourced in zsh 5.0.8-1
* valid when sourced in zsh 5.1.1-1

This difference in behaviour is new in zsh 5.1.1-1, can broke a working zsh 5.0.8-1 script or zshrc, and may be confusing.

*** Additional info: ***
* zsh 5.1.1-1
* test file attached

*** Steps to reproduce: ***
* Downlaod attached test file
* Source it in zsh 5.0.8-1
* Execute it in zsh 5.0.8-1
* Source it in zsh 5.1.1-1
* Execute it in zsh 5.1.1-1