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Notes from C17 External definitions

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Original file line number	Diff line number	Diff line change
`@@ -288,3 +288,15 @@`
`288`	`288`	`}`
`289`	`289`	`goto lab4; // invalid: going INTO scope of VLA.`
`290`	`290`	```
	`291`	`+`
	`292`	`+#### External definitions`
	`293`	`+`
	`294`	`+- "An identifier declared as a typedef name shall not be redeclared as a parameter"`
	`295`	+ ```c
	`296`	`+ typedef int foo;`
	`297`	`+ int baz(foo) int foo; // invalid`
	`298`	`+ {`
	`299`	`+ return 1;`
	`300`	`+ }`
	`301`	+```
	`302`	`+- in the same scope, an identifer can be declared more than once (except identifer with no linkage) while definition is only once`

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