format PE console

section '.data' data readable writeable
_key dd ?

section '.text' code readable executable
entry $
   jmp .mine

start_loop:

.mine:
    

Is this a fasm bug?

   jmp start_loop.mine

start_loop:

.mine    ; label name ---> start_loop.mine    

Mat-Quasar wrote:

Is this a fasm bug?

Nope.

Code:

   jmp start_loop.mine

start_loop:

.mine    ; label name ---> start_loop.mine    

format PE console

section '.data' data readable writeable
_key dd ?

section '.text' code readable executable
entry $
   jmp .mine

start_loop:
   ret

.mine:     

a:
..b:
.c: ; a.c
d:
.e: ; d.e    

Labels beginning with a single dot are attached to the most recent non-dot label.

Code:

a:
..b:
.c: ; a.c
d:
.e: ; d.e    

Every symbol has its own namespace of descendants, called child namespace. When two names are connected with a dot (with no whitespace in between), such identifier refers to an entity named by the second one in the namespace of descendants to the symbol specified by the first one. This operation can be repeated many times within a single identifier, allowing to refer to descendants of descendants in a chain of any length.

space:
space.x = 1
space.y = 2
space.color:
space.color.r = 0
space.color.g = 0
space.color.b = 0
Any of the names in such chain may optionally be followed by the "?" character to mark that it refers to a case-insensitive symbol. If "?" is inserted in the middle of the name (effectively splitting it into separate tokens) such identifier is considered a syntactical error.

When an identifier starts with a dot (in other words: when the name of the parent symbol is empty), it refers to the symbol in the namespace of the most recent regular label defined before current line. This allows to rewrite the above sample like this:

space:
.x = 1
.y = 2
.color:
.color.r = 0
.color.g = 0
.color.b = 0
After the "space" label is defined, it becomes the most recently defined normal label, so the following ".x" refers to the "space.x" symbol and then the ".color" refers to the "space.color".

Manual section 2:

Quote:

Every symbol has its own namespace of descendants, called child namespace. When two names are connected with a dot (with no whitespace in between), such identifier refers to an entity named by the second one in the namespace of descendants to the symbol specified by the first one. This operation can be repeated many times within a single identifier, allowing to refer to descendants of descendants in a chain of any length.

space:
space.x = 1
space.y = 2
space.color:
space.color.r = 0
space.color.g = 0
space.color.b = 0
Any of the names in such chain may optionally be followed by the "?" character to mark that it refers to a case-insensitive symbol. If "?" is inserted in the middle of the name (effectively splitting it into separate tokens) such identifier is considered a syntactical error.

When an identifier starts with a dot (in other words: when the name of the parent symbol is empty), it refers to the symbol in the namespace of the most recent regular label defined before current line. This allows to rewrite the above sample like this:

space:
.x = 1
.y = 2
.color:
.color.r = 0
.color.g = 0
.color.b = 0
After the "space" label is defined, it becomes the most recently defined normal label, so the following ".x" refers to the "space.x" symbol and then the ".color" refers to the "space.color".